Fitness basics
Learning Center
Breast cancer
Learn about this common cancer, including information on prevention, symptoms, diagnosis and treatment.
Klinefelter syndrome
This genetic disorder occurs when a male is born with an extra copy of the X chromosome and may result in low testosterone production and infertility.
Craniopharyngioma
Learn more about this noncancerous tumor that forms near the brain's pituitary gland, including diagnosis and treatment options.
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.
Aortic valve disease
Learn more about diseases that affect the valve between the heart's main pumping chamber and the body's main artery.
Congenital adrenal hyperplasia
This group of inherited genetic conditions limits the adrenal glands' ability to make certain vital hormones.
Ataxia
Often caused by an underlying condition, this loss of muscle control and coordination can impact movement, speech and swallowing.
Vaginal agenesis
In this rare condition that occurs before birth, the vagina doesn't develop and the uterus may only develop partially or not at all. Learn about treatment.
Dry mouth
With this condition, also known as xerostomia, the salivary glands in the mouth don't make enough saliva to keep the mouth wet.
Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS)
This complicated disorder may be triggered by an infection. While there's no cure for chronic fatigue syndrome, treatment focuses on easing symptoms.
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