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Learning Center
Can vitamin D protect against coronavirus disease 2019 (COVID-19)?
Find out what the research says about vitamin D and coronavirus disease 2019 (COVID-19).
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.
Cellulitis infection: Is it contagious?
Cellulitis — a common, potentially serious bacterial skin infection — is not directly contagious.
Cervical cysts: Can they be cancerous?
Cervical cysts usually aren't cancerous. Some types of cervical cysts are so common that they're considered a normal feature of cervical anatomy.
Cigar smoking: Safer than cigarette smoking?
Despite what you might think, cigars aren't that different from cigarettes. Like cigarettes, cigars contain nicotine, tobacco and cancer-causing chemicals.
Clinical depression: What does that mean?
The term "clinical depression" means severe, persistent depression. It's also called major depression or major depressive disorder.
Cold or allergy: Which is it?
Although colds and seasonal allergies share some of the same symptoms, they are very different diseases. Learn how to tell the difference.
Concussion in children: What are the symptoms?
Whether your child's concussion is mild or severe, allow time to recover.
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