1) Various treatment modalities that produce the desired therapeutic effect by means of change of hormone/hormones level. The treatment may include administration of hormones or hormone analogs to the patient, or decreasing the level of hormones in the body by using hormone antagonists, or hormone ablation therapy. The concept covers but not limited to: intermittent or permanent hormone suppression or ablation in treatment of hormone-dependent tumors, hormone replacement therapy of any kind, hormonal component of gender reassignment therapy, hormonal contraception, surgical and radiation castration.

2) Treatment that adds, blocks, or removes hormones. For certain conditions (such as diabetes or menopause), hormones are given to adjust low hormone levels. To slow or stop the growth of certain cancers (such as prostate and breast cancer), synthetic hormones or other drugs may be given to block the body's natural hormones. Sometimes surgery is needed to remove the gland that makes a certain hormone.