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Long QT Syndrome (LQTS) is an inherited condition that affects the heart’s electrical rhythm and can cause fast, erratic heartbeats.

Little League shoulder happens when an athlete throws too often or repeatedly throws the wrong way and hurts his shoulder.

A birthweight less than 5 pounds, 8 ounces, is diagnosed as low birthweight.

A lymphatic malformation is a sponge-like collection of abnormal growths that contain clear fluid.

Lymphedema is a chronic, progressive disease that causes swelling because of non-functioning lymphatic vessels.

Lymphoblastic lymphoma is a cancer of immature cells of the immune system.

Lordosis is an exaggerated curve of the spine that typically affects the lower back.

Low-grade gliomas are brain tumors that originate from glial cells, which support and nourish neurons in the brain.

Lyme disease is the most common tick-borne disease in the U.S.

Labial hypertrophy is a harmless condition in which one or both sides of the labia grow to larger sizes.