Hormone therapy is a treatment based on the use of hormones. This may be true of hormones, or more often of molecules synthesized in the laboratory. Hormone therapy is mainly used in thyroid diseases with a substitution in hypothyroidism for example due to a removal of the thyroid, but also in cases of stunting. One of the most prescribed forms of hormone therapy is hormone replacement therapy that allows postmenopausal women not to suffer symptoms caused by hormonal deficiency. Hormone therapy is also used as part of the management of certain cancers, including breast cancer.