Hormonal therapy is the use of hormones (substances in our body produced by an organ or gland) to trigger an increase in function or activity of another body part, or increase release of another hormone. Hormones are used in certain cancers that respond to stimulation of specific hormones. They may be used in cancers of the breast, cervix, kidney, skin (malignant melanoma), ovary, and prostate.
Hormones stimulate or cause overproduction of certain substances in the body. Side effects can occur as a result.