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Hepatitis   Infection with one of the hepatitis viruses (A,B or C) which causes acute or chronic inflammation of the liver.   HIV   The AIDS virus   Hormone   Hormones are natural chemical substances produced by the body some of which control the development and release of the egg from the ovary during each menstrual cycle. Natural and synthetic preparations of those hormones are used to increase the number of eggs produced in a cycle.   Human chorionic gonadotropin (hCG)   A hormone produced by the placenta during pregnancy; its detection is the basis for most pregnancy tests. Also used during ovulation induction to trigger ovulation.   Human menopausal gonadotropin (hMG)   An ovulation drug, containing follicle stimulating hormone (FSH) and luteinizing hormone (LH), derived from the urine of postmenopausal women.   Humagon   Drug company name for hMG   Hyperstimulation   Stimulation of the ovaries to mature too many eggs   Hyperstimulation syndrome   A possible side effect of treatment with human menopausal gonadotropin in which the ovaries become painful and swollen and fluid may accumulate in the abdomen and chest.   Hypothalamus   A thumb-sized area in the base of the brain that controls many body functions and regulates the pituitary gland.   Hysterosalpingogram   An radiographic procedure in which a special dye is injected into the uterus to illustrate the inner contour of the uterus and degree of openness (patency) of the fallopian tubes.   Hysteroscopy   Visual instrumental inspection of the cervical canal and uterine cavity through a hysteroscope (telescope).