Fitness basics
Learning Center
Cholera
Cholera is a treatable — yet potentially fatal — bacterial disease that causes diarrhea and dehydration. Learn how to lower your risk.
Choroid plexus carcinoma
This rare type of cancerous brain tumor occurs mainly in children under 2. Treatment usually involves surgery and radiation therapy.
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.
Circumcision (male)
Learn about the benefits and risks of surgery to remove the skin that covers the tip of the penis.
Cleft lip and cleft palate
Surgery can fix openings or splits in the upper lip, or the roof of the mouth (palate), or both types of these birth defects.
Clinical depression: What does that mean?
The term "clinical depression" means severe, persistent depression. It's also called major depression or major depressive disorder.
Clubfoot
This term describes a range of congenital foot abnormalities in which the foot is twisted out of shape or position, keeping it from moving up and down.
Coarctation of the aorta
Learn more about the causes and treatment of this usually congenital heart condition that is treatable but requires lifelong follow-up.
Cochlear implants
This electronic device improves hearing in people who have severe hearing loss from inner ear damage.
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.
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