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Hodgkin lymphoma is cancer that begins in the lymph system in white blood cells called lymphocytes. When these cells become

Homocysteine is an amino acid normally found in small amounts in the blood. Abnormal levels may mean that you are not getting

Home pregnancy tests use a sample of a woman's urine to detect the presence of a hormone (called human chorionic gonadotropin, or

Hookworm disease is caused by a parasite that infects the intestines. Hookworms are usually found only in the tropics. Hookworms

A hormone, such as insulin or estrogen, is a substance released by an organ or tissue that controls the activity of organs or

A hiatal hernia occurs when a small portion of the stomach pushes upward through the diaphragm, a sheetlike muscle that separates

The human papillomavirus (HPV) may cause warts, including genital warts, and may cause cervical cancer and changes in the cervix

Huntington disease is a rare inherited (genetic) condition that causes parts of the brain to break down and lose some normal

A hydrocele is a buildup of fluid around one or both testicles that causes the scrotum or groin area to swell. The swelling may be

Hydrocephalus, or "water on the brain," is the buildup of excess cerebrospinal fluid (CSF) within the brain. The pressure from the