Fitness basics
Learning Center
Mittelschmerz
Some women experience pain on one side of the lower abdomen midway through their menstrual cycles. This cyclic pelvic pain is known as mittelschmerz.
X-linked agammaglobulinemia
This genetic disease weakens the immune system, mainly in males, and leads to having infections often.
Vaginal fistula
Learn about this unusual opening that forms between the vagina and another organ.
Moyamoya disease
This rare disorder occurs when blood flow to the brain is blocked or narrowed and a tiny cluster of blood vessels forms at the base of the brain.
Niemann-Pick disease
A condition passed down in families that affects how the body breaks down and uses fats. Fat buildup in cells damages the nerves, brain and other organs.
Atrial tachycardia
This type of fast heartbeat may occur after heart surgery or during pregnancy. But infections may trigger it, too. Learn how it's diagnosed and treated.
Diabetes
Learn more about the different types of this blood sugar disorder, who's at risk and how each type can be treated.
Invasive lobular carcinoma
Breast cancer that begins in the milk-producing glands of the breast is uncommon. Learn what sets lobular carcinoma apart from other breast cancer types.
Female sexual dysfunction
Learn more about female sexual difficulties — what causes them and possible treatments, including medications.
Incompetent cervix
Sometimes the cervix opens and thins early, putting a pregnancy at risk. Learn more about this hard-to-diagnose condition.
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