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Disease

Klinefelter syndrome

In this condition, a genetic male has an extra X sex chromosome. This may affect the growth of testicles and result in low testosterone.
Disease

Klippel-Trenaunay syndrome

Main signs of this congenital disorder involve a red birthmark (port-wine stain), vein malformations, and overgrowth of tissues and bones.
Disease

Lichen sclerosus

Learn more about the causes, symptoms, complications, treatment and self-care tips for this blotchy skin condition that affects the genital and anal areas.
Disease

Lobular carcinoma in situ (LCIS)

If a breast biopsy reveals you have LCIS, your risk of breast cancer is increased. Learn how you can reduce your risk through medications and other strategies.
Disease

Long QT syndrome

Learn more about the causes and treatment of this heart rhythm disorder that can cause fast, chaotic heartbeats.
Disease

Low sex drive in women

Many women have dips in sexual desire at some point. But you can get your sex drive back. Learn about the causes and treatments of lost libido in women.
Disease

Low sperm count

This health concern can make it challenging to start a pregnancy. Learn about possible causes and treatment.
Disease

Lynch syndrome

Learn about this condition that passes from parents to children, raising the risk of colon cancer, endometrial cancer and other kinds of cancer.
Disease

Malignant peripheral nerve sheath tumors (MPNST)

These cancers form in the linings of nerves. Treatment includes surgery, radiation therapy and, sometimes, chemotherapy.
Disease

Marfan syndrome

This inherited disorder affects the skeleton and the eyes. It can also harm the large blood vessel that carries blood from the heart to the rest of the body.
Disease

Median arcuate ligament syndrome (MALS)

Stomach pain after eating isn't always indigestion. It could be MALS, also called celiac artery compression. Know the warning symptoms.
Disease

Metabolic syndrome

Having three or more specific risk factors, such as high blood pressure or abdominal fat, boosts your risk of type 2 diabetes and heart disease.

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