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Learning Center
Diarrhea
Learn more about what causes this common digestive condition, and how you can treat and prevent it.
Dementia
This group of symptoms with many causes affects memory, thinking and social abilities. Some symptoms may be reversible.
Delirium
Learn what may cause this change in mental abilities. Symptoms develop fast and include confusion and being unaware of surroundings.
Dehydration
Dehydration is especially common and dangerous for infants, young children and older adults. Learn more about treating and preventing dehydration.
Craniopharyngioma
Learn more about this noncancerous tumor that forms near the brain's pituitary gland, including diagnosis and treatment options.
Coronavirus disease 2019 (COVID-19)
Coronavirus disease 2019 (COVID-19) is an illness caused by the virus SARS-CoV-2. Learn more about the symptoms, risks and ways to protect yourself.
Coma
Learn what can cause this state of prolonged loss of consciousness. While a coma rarely lasts longer than a few weeks, some people never wake from one.
Chronic cough
A cough that lasts for weeks could be caused by smoking, postnasal drip, asthma, acid reflux, respiratory infections, COPD or another underlying problem.
Cataracts
Are things starting to look fuzzy or blurry? Find out about symptoms, diagnosis and treatment for this common eye condition.
Bullous pemphigoid
Learn about the symptoms, treatment and self-care strategies for this blistery skin condition that affects older adults.
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