Balance equilibrium. Balance Disorders: Understanding Causes, Symptoms, and Treatment Options
What are the main causes of balance disorders. How do balance problems affect daily life. What symptoms indicate a potential balance disorder. Which treatment options are available for balance issues. How does the body maintain equilibrium. Can balance disorders be prevented. When should you seek medical help for dizziness or vertigo.
The Complexity of Balance Disorders: An Overview
Balance disorders are complex conditions that affect millions of people worldwide, causing a range of symptoms from mild dizziness to severe vertigo. These disorders can significantly impact an individual’s quality of life, making simple tasks like walking or standing challenging and potentially dangerous. Understanding the intricacies of balance disorders is crucial for proper diagnosis and effective treatment.
Prevalence and Impact
According to recent statistics, approximately 15% of American adults, or 33 million people, experienced balance or dizziness problems in 2008. This high prevalence underscores the importance of addressing these issues in the medical community. Balance disorders not only affect physical well-being but can also lead to psychological and emotional hardships, impacting various aspects of daily life.
Recognizing the Symptoms of Balance Disorders
Identifying the symptoms of balance disorders is the first step towards seeking appropriate medical care. While symptoms can vary from person to person, there are several common indicators to watch for:
- Dizziness or vertigo (a spinning sensation)
- Falling or feeling as if you’re going to fall
- Staggering when walking
- Lightheadedness, faintness, or a floating sensation
- Blurred vision
- Confusion or disorientation
Additionally, individuals may experience nausea, vomiting, diarrhea, changes in heart rate and blood pressure, and feelings of fear, anxiety, or panic. These symptoms can be transient, coming and going over short periods, or persist for extended durations, potentially leading to fatigue and depression.
Differentiating Dizziness Types
It’s important to note that the term “dizziness” can mean different things to different people. For some, it might be a fleeting feeling of faintness, while for others, it could be an intense sensation of spinning (vertigo) that lasts for a prolonged period. Understanding these nuances is crucial for accurate diagnosis and treatment.
Unraveling the Causes of Balance Disorders
Balance disorders can stem from various sources, making diagnosis challenging. Some common causes include:
- Medications
- Ear infections
- Head injuries
- Inner ear or brain abnormalities
- Low blood pressure
- Skeletal or visual system problems (e.g., arthritis, eye muscle imbalance)
Age is also a significant factor, with the risk of balance problems increasing as individuals grow older. However, it’s worth noting that many balance disorders can onset suddenly and without an apparent cause, adding to the complexity of these conditions.
The Role of the Vestibular System
The vestibular system, located in the inner ear, plays a crucial role in maintaining balance. This intricate system consists of the labyrinth, a maze-like structure made of bone and soft tissue. Within the labyrinth are the semicircular canals and two otolithic organs: the utricle and saccule. These structures work together to detect head position and movement, sending signals to the brain to maintain equilibrium.
The Intricate Mechanics of Balance
Maintaining balance is a complex process involving multiple body systems working in harmony. The body relies on a series of signals to the brain from several organs and structures, primarily:
- Eyes (visual system)
- Ears (vestibular system)
- Muscles and touch sensors in the legs (proprioceptive system)
These systems continuously send information to the brain, allowing it to adjust body position and maintain stability. When any part of this intricate system malfunctions, balance disorders can occur.
The Semicircular Canals: Nature’s Gyroscope
The semicircular canals contain three fluid-filled ducts arranged at roughly right angles to one another. These structures act like a biological gyroscope, telling your brain when your head rotates. Each canal contains a gelatinous structure called the cupula, which sits on a cluster of sensory hair cells. As you move your head, the fluid in the canals moves, causing the cupula to flex, which in turn bends the stereocilia of the hair cells. This bending creates nerve signals that inform the brain about head movements.
Otolithic Organs: Gravity’s Messengers
The utricle and saccule, collectively known as the otolithic organs, play a vital role in sensing linear acceleration and head position relative to gravity. These fluid-filled pouches contain sensory hair cells with stereocilia extending into a gel-like layer containing tiny calcium carbonate crystals called otoconia.
How do otolithic organs work? When you move your head, gravity pulls on these crystals, which then move the stereocilia. This movement generates signals that tell your brain about changes in head position. This intricate system allows you to perceive whether you’re sitting up, leaning back, or lying down, as well as any directional movement of your head.
The Integrated Balance System: A Symphony of Senses
Balance is not maintained by the vestibular system alone. It’s a complex interplay between multiple sensory systems, including:
- Vestibular system (inner ear)
- Visual system (eyes)
- Proprioceptive system (muscles and joints)
These systems work together to control body position, maintain stable posture, and keep balance during movement. They also help maintain a stable visual focus on objects when your body changes position. When signals from any of these sensory systems malfunction, balance problems can occur.
The Role of the Brain in Balance
The brain acts as the central processing unit for balance, integrating information from various sensory inputs. It continuously analyzes data from the vestibular, visual, and proprioceptive systems to maintain equilibrium. When there’s a discrepancy in these inputs or when the brain’s processing is impaired, it can lead to balance disorders.
Diagnosing Balance Disorders: A Multi-faceted Approach
Diagnosing balance disorders often requires a comprehensive approach due to the complexity of the balance system and the variety of potential causes. Healthcare providers may use a combination of methods to determine the underlying cause of balance issues:
- Medical history review
- Physical examination
- Hearing and balance tests
- Imaging studies (e.g., MRI, CT scan)
- Blood tests
One key diagnostic tool is the electronystagmography (ENG) or videonystagmography (VNG) test, which evaluates the vestibular system and its connections to the brain. These tests measure eye movements in response to various stimuli, providing valuable information about the balance system’s functioning.
The Importance of Differential Diagnosis
Given that balance disorders can stem from various causes, differential diagnosis is crucial. Conditions such as benign paroxysmal positional vertigo (BPPV), Ménière’s disease, vestibular neuritis, and central nervous system disorders can all present with similar symptoms. Accurate diagnosis is essential for determining the most effective treatment approach.
Treatment Options for Balance Disorders
The treatment of balance disorders depends on the underlying cause and the specific symptoms experienced by the individual. Some common treatment approaches include:
- Vestibular rehabilitation therapy
- Medication (e.g., antihistamines, anticholinergics, benzodiazepines)
- Dietary changes (particularly for Ménière’s disease)
- Surgery (in severe cases or for specific conditions)
- Lifestyle modifications
Vestibular rehabilitation therapy is a specialized form of physical therapy that aims to retrain the brain to process balance information more effectively. It often involves exercises to improve gaze stability, balance, and gait.
The Role of Medication in Managing Balance Disorders
While medications can be effective in managing symptoms of balance disorders, they are often used in conjunction with other treatment approaches. Antihistamines may help with dizziness and nausea, while benzodiazepines can reduce anxiety associated with vertigo. However, it’s important to note that some medications can actually cause or exacerbate balance problems, so a thorough medication review is often part of the diagnostic process.
Living with Balance Disorders: Coping Strategies and Lifestyle Adjustments
Living with a balance disorder can be challenging, but there are several strategies that can help individuals manage their symptoms and improve their quality of life:
- Making home modifications to reduce fall risks
- Using assistive devices like canes or walkers when necessary
- Practicing relaxation techniques to manage anxiety
- Engaging in regular, safe exercise to improve overall balance and strength
- Avoiding triggers that exacerbate symptoms (e.g., certain head movements, dietary triggers)
Support groups can also be valuable resources for individuals with balance disorders, providing emotional support and practical advice for managing daily life.
The Psychological Impact of Balance Disorders
The psychological toll of living with a balance disorder should not be underestimated. Many individuals experience anxiety, depression, and social isolation as a result of their symptoms. Addressing these psychological aspects is an important part of a comprehensive treatment plan, often involving counseling or cognitive-behavioral therapy.
Preventing Balance Disorders: Proactive Measures for Better Health
While not all balance disorders can be prevented, there are steps individuals can take to reduce their risk or manage existing conditions more effectively:
- Regular exercise to improve strength and flexibility
- Maintaining a healthy diet and staying hydrated
- Managing chronic health conditions like diabetes and heart disease
- Avoiding excessive alcohol consumption
- Protecting the head from injuries
- Regular check-ups to monitor hearing and balance
Additionally, practicing good fall prevention strategies, especially for older adults, can help reduce the risk of injuries related to balance disorders.
The Role of Nutrition in Balance Health
Proper nutrition plays a crucial role in maintaining overall health, including balance function. Certain nutrients, such as vitamin D and calcium, are essential for bone health and can indirectly affect balance. Moreover, staying hydrated is important for maintaining proper fluid levels in the inner ear, which is crucial for balance function.
Future Directions in Balance Disorder Research and Treatment
The field of balance disorder research is continually evolving, with new insights and treatment approaches emerging regularly. Some promising areas of research include:
- Advanced imaging techniques for more accurate diagnosis
- Gene therapy for hereditary balance disorders
- Improved vestibular implants for severe balance dysfunction
- Virtual reality-based rehabilitation techniques
- Personalized medicine approaches based on genetic and environmental factors
These advancements hold the potential to improve diagnosis, treatment, and quality of life for individuals with balance disorders in the coming years.
The Promise of Interdisciplinary Approaches
As our understanding of balance disorders grows, there’s an increasing recognition of the need for interdisciplinary approaches to diagnosis and treatment. Collaboration between otolaryngologists, neurologists, physical therapists, and other specialists can provide more comprehensive care and better outcomes for patients with complex balance disorders.
Balance disorders, while often challenging to diagnose and treat, are an active area of medical research and clinical innovation. As our understanding of these conditions continues to grow, so too do the options for effective management and treatment. For individuals experiencing symptoms of a balance disorder, seeking prompt medical attention is crucial. With proper diagnosis and treatment, many people with balance disorders can significantly improve their symptoms and quality of life.
Balance Disorders — Causes, Types & Treatment
What is a balance disorder?
A balance disorder is a condition that makes you feel unsteady or dizzy. If you are standing, sitting, or lying down, you might feel as if you are moving, spinning, or floating. If you are walking, you might suddenly feel as if you are tipping over.
Everyone has a dizzy spell now and then, but the term “dizziness” can mean different things to different people. For one person, dizziness might mean a fleeting feeling of faintness, while for another it could be an intense sensation of spinning (vertigo) that lasts a long time.
About 15 percent of American adults (33 million) had a balance or dizziness problem in 2008. Balance disorders can be caused by certain health conditions, medications, or a problem in the inner ear or the brain. A balance disorder can profoundly affect daily activities and cause psychological and emotional hardship.
What are the symptoms of a balance disorder?
If you have a balance disorder, your symptoms might include:
- Dizziness or vertigo (a spinning sensation).
- Falling or feeling as if you are going to fall.
- Staggering when you try to walk.
- Lightheadedness, faintness, or a floating sensation.
- Blurred vision.
- Confusion or disorientation.
Other symptoms might include nausea and vomiting; diarrhea; changes in heart rate and blood pressure; and fear, anxiety, or panic. Symptoms may come and go over short time periods or last for a long time, and can lead to fatigue and depression.
What causes balance disorders?
Causes of balance problems include medications, ear infection, a head injury, or anything else that affects the inner ear or brain. Low blood pressure can lead to dizziness when you stand up too quickly. Problems that affect the skeletal or visual systems, such as arthritis or eye muscle imbalance, can also cause balance disorders. Your risk of having balance problems increases as you get older.
Unfortunately, many balance disorders start suddenly and with no obvious cause.
How does my body keep its balance?
Your sense of balance relies on a series of signals to your brain from several organs and structures in your body, specifically your eyes, ears, and the muscles and touch sensors in your legs. The part of the ear that assists in balance is known as the vestibular system, or the labyrinth, a maze-like structure in your inner ear made of bone and soft tissue.
Structures of the balance system inside the inner ear
Source: NIH/NIDCD
Within the labyrinth are structures known as semicircular canals. The semicircular canals contain three fluid-filled ducts, which form loops arranged roughly at right angles to one another. They tell your brain when your head rotates. Inside each canal is a gelatin-like structure called the cupula [KEW-pyew-lah], stretched like a thick sail that blocks off one end of each canal. The cupula sits on a cluster of sensory hair cells. Each hair cell has tiny, thin extensions called stereocilia that protrude into the cupula.
When you turn your head, fluid inside the semicircular canals moves, causing the cupulae to flex or billow like sails in the wind, which in turn bends the stereocilia. This bending creates a nerve signal that is sent to your brain to tell it which way your head has turned.
Between the semicircular canals and the cochlea (a snail-shaped, fluid-filled structure in the inner ear) lie two otolithic [oh-toe-LITH-ic] organs: fluid-filled pouches called the utricle [YOU-trih-cull] and the saccule [SACK-kewl]. These organs tell your brain the position of your head with respect to gravity, such as whether you are sitting up, leaning back, or lying down, as well as any direction your head might be moving, such as side to side, up or down, forward or backward.
The utricle and the saccule also have sensory hair cells lining the floor or wall of each organ, with stereocilia extending into an overlying gel-like layer. Here, the gel contains tiny, dense grains of calcium carbonate called otoconia [oh-toe-CONE-ee-ah]. Whatever the position of your head, gravity pulls on these grains, which then move the stereocilia to signal your head’s position to your brain. Any head movement creates a signal that tells your brain about the change in head position.
When you move, your vestibular system detects mechanical forces, including gravity, that stimulate the semicircular canals and the otolithic organs. These organs work with other sensory systems in your body, such as your vision and your musculoskeletal sensory system, to control the position of your body at rest or in motion. This helps you maintain stable posture and keep your balance when you’re walking or running. It also helps you keep a stable visual focus on objects when your body changes position.
When the signals from any of these sensory systems malfunction, you can have problems with your sense of balance, including dizziness or vertigo. If you have additional problems with motor control, such as weakness, slowness, tremor, or rigidity, you can lose your ability to recover properly from imbalance. This raises the risk of falling and injury.
What are some types of balance disorders?
There are more than a dozen different balance disorders. Some of the most common are:
- Benign paroxysmal positional vertigo (BPPV) or positional vertigo: A brief, intense episode of vertigo triggered by a specific change in the position of the head. You might feel as if you’re spinning when you bend down to look under something, tilt your head to look up or over your shoulder, or roll over in bed. BPPV occurs when loose otoconia tumble into one of the semicircular canals and affect how the cupula works. This keeps the cupula from flexing properly, sending incorrect information about your head’s position to your brain, and causing vertigo. BPPV can result from a head injury, or can develop just from getting older.
- Labyrinthitis: An infection or inflammation of the inner ear that causes dizziness and loss of balance. It is often associated with an upper respiratory infection, such as the flu.
- Ménière’s disease: Episodes of vertigo, hearing loss, tinnitus (a ringing or buzzing in the ear), and a feeling of fullness in the ear. It may be associated with a change in fluid volume within parts of the labyrinth, but the cause or causes are still unknown. For more information, read the NIDCD fact sheet Ménière’s Disease.
- Vestibular neuronitis: An inflammation of the vestibular nerve that can be caused by a virus, and primarily causes vertigo.
- Perilymph fistula: A leakage of inner ear fluid into the middle ear. It causes unsteadiness that usually increases with activity, along with dizziness and nausea. Perilymph fistula can occur after a head injury, dramatic changes in air pressure (such as when scuba diving), physical exertion, ear surgery, or chronic ear infections. Some people are born with perilymph fistula.
- Mal de Debarquement syndrome (MdDS): A feeling of continuously rocking, swaying, or bobbing, typically after an ocean cruise or other sea travel, or even after prolonged running on a treadmill. Usually the symptoms go away within a few hours or days after you reach land or stop using the treadmill. Severe cases, however, can last months or even years, and the cause remains unknown.
How are balance disorders diagnosed?
Diagnosis of a balance disorder is difficult. To find out if you have a balance problem, your primary doctor may suggest that you see an otolaryngologist and an audiologist. An otolaryngologist is a physician and surgeon who specializes in diseases and disorders of the ear, nose, neck, and throat. An audiologist is a clinician who specializes in the function of the hearing and vestibular systems.
Dislodging otoconia using the Epley maneuver.
Source: NIH/NIDCD
You may be asked to participate in a hearing examination, blood tests, a video nystagmogram (a test that measures eye movements and the muscles that control them), or imaging studies of your head and brain. Another possible test is called posturography. For this test, you stand on a special movable platform in front of a patterned screen.
Posturography measures how well you can maintain steady balance during different platform conditions, such as standing on an unfixed, movable surface. Other tests, such as rotational chair testing, brisk head-shaking testing, or even tests that measure eye or neck muscle responses to brief clicks of sound, may also be performed. The vestibular system is complex, so multiple tests may be needed to best evaluate the cause of your balance problem.
How are balance disorders treated?
The first thing an otolaryngologist will do if you have a balance problem is determine if another health condition or a medication is to blame. If so, your doctor will treat the condition, suggest a different medication, or refer you to a specialist if the condition is outside his or her expertise.
If you have BPPV, your otolaryngologist or audiologist might perform a series of simple movements, such as the Epley maneuver, to help dislodge the otoconia from the semicircular canal. In many cases, one session works; other people need the procedure several times to relieve their dizziness.
If you are diagnosed with Ménière’s disease, your otolaryngologist may recommend that you make some changes to your diet and, if you are a smoker, that you stop smoking. Anti-vertigo or anti-nausea medications may relieve your symptoms, but they can also make you drowsy. Other medications, such as gentamicin (an antibiotic) or corticosteroids may be used. Although gentamicin may reduce dizziness better than corticosteroids, it occasionally causes permanent hearing loss. In some severe cases of Ménière’s disease, surgery on the vestibular organs may be needed.
Some people with a balance disorder may not be able to fully relieve their dizziness and will need to find ways to cope with it. A vestibular rehabilitation therapist can help you develop an individualized treatment plan.
Talk to your doctor about whether it’s safe to drive, and about ways to lower your risk of falling and getting hurt during daily activities, such as when you walk up or down stairs, use the bathroom, or exercise. To reduce your risk of injury from dizziness, avoid walking in the dark. Wear low-heeled shoes or walking shoes outdoors. If necessary, use a cane or walker and modify conditions at your home and workplace, such as adding handrails.
When should I seek help if I think I have a balance disorder?
To help you decide whether to seek medical help for dizziness or balance problems, ask yourself the following questions. If you answer “yes” to any of these questions, talk to your doctor:
- Do I feel unsteady?
- Do I feel as if the room is spinning around me, even for a very brief time?
- Do I feel as if I’m moving when I know I’m sitting or standing still?
- Do I lose my balance and fall?
- Do I feel as if I’m falling?
- Do I feel lightheaded or as if I might faint?
- Do I have blurred vision?
- Do I ever feel disoriented—losing my sense of time or location?
How can I help my doctor make a diagnosis?
You can help your doctor make a diagnosis and determine a treatment plan by answering the questions below. Be prepared to discuss this information during your appointment.
- The best way I can describe my dizziness or balance problem is:
- Is there a spinning sensation, and if so, which way does the room spin?
- Is the dizziness/spinning caused by any specific motion or does it occur even when sitting or lying still?
- Are there any other symptoms that occur at the same time as the dizziness/spinning, such as hearing loss, tinnitus, a feeling of pressure in one or both ears, or a headache?
- Does anything seem to help the dizziness/spinning?
- How often do I feel dizzy or have trouble keeping my balance? How long do the dizziness or spinning episodes last (seconds, minutes, hours, days)?
- Have I ever fallen?
- When did I fall?
- Where did I fall?
- Under what conditions did I fall?
- How often have I fallen?
- These are the medicines I take. Include all prescription medications; all over-the-counter medicine, such as aspirin, antihistamines, or sleep aids; and all vitamin supplements and alternative or homeopathic remedies:
- Name of medicine or supplement: ______________________.
- How much (milligrams) _____ and how often (times) ______ per day.
- The condition I take this medicine for is: __________________________.
What research is being done on balance disorders?
Scientists supported by the National Institute on Deafness and Other Communication Disorders (NIDCD) are studying animal ears to learn if inner-ear structures that help with balance but are destroyed by aging, medications, infections, or trauma can someday be regrown in people with balance problems. Other NIDCD-supported scientists are testing vestibular prostheses—miniature devices that may be worn outside the body or implanted into the ear to regulate the function of balance organs in the inner ear and ease dizziness. Some of these devices are being tested on volunteers in clinical trials, and others are still being developed. Visit the NIH Clinical Research Trials and You website to read about these and other clinical trials that are recruiting volunteers.
NIDCD-funded scientists are also working to develop much-needed tests to appropriately diagnose balance disorders. Standardized tests will help doctors determine the best way to help individuals restore their sense of balance and quality of life. These tests will also help us understand how many people suffer from balance disorders, and track whether the sense of balance is restored following treatment.
Where can I find additional information about balance disorders?
The NIDCD maintains a directory of organizations that provide information on the normal and disordered processes of hearing, balance, taste, smell, voice, speech, and language.
For more information, contact us at:
NIDCD Information Clearinghouse
1 Communication Avenue
Bethesda, MD 20892-3456
Toll-free voice: (800) 241-1044
Toll-free TTY: (800) 241-1055
Email: [email protected]
NIH Pub. No. 00-4374
December 2017
Older Adults and Balance Problems
Have you ever felt dizzy, lightheaded, or as if the room were spinning around you? These can be troublesome sensations. If the feeling happens often, it could be a sign of a balance problem.
On this page:
Many older adults experience problems with balance and dizziness. Problems can be caused by certain medications, balance disorders, or other medical conditions. Balance problems are one reason older people fall. Maintaining good balance as you age and learning about fall prevention can help you get around, stay independent, and carry out daily activities.
Causes of balance problems
Read and share this infographic and help spread the word about how to help prevent falls.
People are more likely to have problems with balance as they grow older. In some cases, you can help reduce your risk for certain balance problems, but problems often can start suddenly and without obvious cause.
Balance problems can be caused by certain medications or medical conditions. The list below covers some common causes of balance problems.
- Medications. Check with your doctor if you notice balance problems while taking certain medications. Ask if other medications can be used instead, if the dosage can be safely reduced, or if there are other ways to reduce unwanted side effects.
- Inner ear problems. A part of the inner ear called the labyrinth is responsible for balance. When the labyrinth becomes inflamed, a condition called labyrinthitis occurs, causing vertigo and imbalance. Certain ear diseases and infections can lead to labyrinthitis.
- Alcohol. Alcohol in the blood can also cause dizziness and balance problems by affecting how the inner ear works.
- Other medical conditions. Certain conditions, such as diabetes, heart disease, stroke, or problems with your vision, thyroid, nerves, or blood vessels can cause dizziness and other balance problems.
Visit the NIH National Institute on Deafness and Other Communication Disorders website for more information on specific balance disorders.
Symptoms of balance disorders
If you have a balance disorder, you might experience symptoms such as:
- Dizziness or vertigo (a spinning sensation)
- Falling or feeling as if you are going to fall
- Staggering when you try to walk
- Lightheadedness, faintness, or a floating sensation
- Blurred vision
- Confusion or disorientation
Other symptoms might include nausea and vomiting; diarrhea; changes in heart rate and blood pressure and feelings of fear, anxiety, or panic. Symptoms may come and go over short periods or last for a long time and can lead to fatigue and depression.
Treatments for balance problems and disorders
Exercises that involve moving the head and body in certain ways can help treat some balance disorders. Patient-specific exercises are developed by a physical therapist or other professional who understands balance and its relationship with other systems in the body.
Balance problems due to high blood pressure may be managed by eating less salt (sodium), maintaining a healthy weight, and exercising. Balance problems due to low blood pressure may be managed by drinking plenty of fluids such as water; avoiding alcohol; and being cautious regarding your body’s posture and movement, such as never standing up too quickly. Consult with your doctor about making any changes in your diet or activity level.
Coping with a balance disorder
Some people with a balance disorder may not be able to fully relieve their dizziness and will need to find ways to cope with it. A vestibular rehabilitation therapist can help develop an individualized treatment plan.
Chronic balance problems can affect all aspects of your life, including your relationships, work performance, and your ability to carry out daily activities. Support groups provide the opportunity to learn from other people with similar experiences and challenges.
If you have trouble with your balance, talk to your doctor about whether it’s safe to drive, and about ways to lower your risk of falling during daily activities, such as walking up or down stairs, using the bathroom, or exercising. To reduce your risk of injury from dizziness, do not walk in the dark. Avoid high heels and, instead, wear nonskid, rubber-soled, low-heeled shoes. Don’t walk on stairs or floors in socks or in shoes and slippers with smooth soles. If necessary, use a cane or walker. Make changes to add safety features at your home and workplace, such as adding handrails.
Learn more about falls and falls prevention.
Read about this topic in Spanish. Lea sobre este tema en español.
For more information on balance problems
MedlinePlus
National Library of Medicine
www.medlineplus.gov
Mayo Clinic
www.mayoclinic.org/patient-care-and-health-information
National Institute on Deafness and Other Communication Disorders
800-241-1044
800-241-1055 (TTY)
[email protected]
www.nidcd.nih.gov
This content is provided by the NIH National Institute on Aging (NIA). NIA scientists and other experts review this content to ensure it is accurate and up to date.
Content reviewed:
September 12, 2022
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