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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

Hyperparathyroidism is overactivity of the tiny glands in the neck that are next to the thyroid gland (parathyroid glands). The

Hyperthyroidism means that your body has too much thyroid hormone, which controls how your body uses energy. Too much thyroid

Hyperventilation is breathing that is deeper and more rapid than normal, which causes the amount of carbon dioxide (CO2) in the

The hypothalamus is a region of the brain that regulates sleep cycles, body temperature, pituitary gland activity, and other