Healthy diets
Learning Center
Carbohydrate-loading diet
Read about the potential benefits of eating extra carbohydrates before endurance exercise. Diet details and a sample meal plan are included.
Cataract surgery
Cataract surgery — Overview covers risks, complications, results of this eye surgery.
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.
Clear liquid diet
Need to be on a clear liquid diet? Learn which foods to eat and which foods to avoid.
Cluster headache
These painful headaches cause severe pain on one side of the head and tend to occur in bouts called cluster periods.
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.
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