Strength training
Learning Center
Cataract surgery: When is the laser method a good idea?
Laser-assisted cataract surgery is an advanced approach used to help people with astigmatism.
Cataracts
Are things starting to look fuzzy or blurry? Find out about symptoms, diagnosis and treatment for this common eye condition.
Chickenpox
Learn more about preventing this once-common childhood illness. Also, find out how to recognize and manage it.
Cluster headache
These painful headaches cause severe pain on one side of the head and tend to occur in bouts called cluster periods.
Core exercises: Why you should strengthen your core muscles
Core exercises strengthen your abs and other core muscles for better balance and stability.
Coronary artery spasm: Cause for concern?
This sudden, temporary squeezing of the muscles in an artery wall reduces blood flow to the heart. Know the causes and treatment.
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.
Cushing syndrome
High levels of the hormone cortisol in your body cause this endocrine disorder. Learn about symptoms, causes and treatment.
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Some information you come across about COVID-19 may be out of date or false.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.
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