Fitness basics
Learning Center
Congenital myasthenic syndromes
These rare hereditary conditions result in a problem in nerve stimulation, causing muscle weakness that worsens with physical activity.
Congenital mitral valve anomalies
These heart problems at birth cause the mitral valve to leak or become narrowed. Know the symptoms and treatment.
Congenital heart defects in children
Learn about symptoms, tests and treatments for children born with a problem in the structure of the heart.
Congenital adrenal hyperplasia
This group of inherited genetic conditions limits the adrenal glands' ability to make certain vital hormones.
Common warts
Find out tips for preventing and dealing with this common skin condition that causes small, rough growths on your fingers and hands.
Color blindness
Is it red or is it green? Learn more about what causes color blindness and how to tell whether or not you can distinguish between certain shades of color.
Coarctation of the aorta
This heart condition is usually present at birth. It's treatable but requires lifelong health checkups. Learn about the causes and treatment.
Choroid plexus carcinoma
This rare type of cancerous brain tumor occurs mainly in children under 2. Treatment usually involves surgery and radiation therapy.
Cholera
Cholera is a treatable — yet potentially fatal — bacterial disease that causes diarrhea and dehydration. Learn how to lower your risk.
Childhood obesity
Childhood obesity can lead to various conditions, including type 2 diabetes and high blood pressure. Learn how to protect your child's health.
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