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Coronary calcium scan
This heart CT test can show calcium deposits in the blood vessels. Know how the findings relate to your heart disease risk.
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.
Craniopharyngioma
Learn more about this noncancerous tumor that forms near the brain's pituitary gland, including diagnosis and treatment options.
Cystoscopy
During cystoscopy, your doctor examines the inside of your bladder using a special instrument that's inserted into the bladder through the urethra.
Debunking COVID-19 myths
Some information you come across about COVID-19 may be out of date or false. Learn about COVID-19 myths so you can bust them when you see them.
Dehydration
Dehydration is especially common and dangerous for infants, young children and older adults. Learn more about treating and preventing dehydration.
Delirium
Learn what may cause this change in mental abilities. Symptoms develop fast and include confusion and being unaware of surroundings.
Dementia
This group of symptoms with many causes affects memory, thinking and social abilities. Some symptoms may be reversible.
Dense breast tissue: What it means to have dense breasts
Find out what it means if your mammogram report says you have dense breast tissue. Learn about additional breast cancer screening tests to consider.
Dental floss vs. water flosser: Which is better?
Cleaning between your teeth every day is an important part of good oral health.
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