Hormones are chemical messengers released into circulation to affect target cells with appropriate receptors. Endocrine regulation commonly uses negative feedback.
The hypothalamus links nervous and endocrine regulation. The pituitary influences growth, thyroid, adrenal, reproductive and water-balance pathways through multiple hormones.
Thyroid hormones influence metabolic activity; calcitonin participates in calcium regulation. Parathyroid hormone is a major regulator of blood calcium.
Adrenal cortex produces steroid hormones including cortisol and aldosterone; adrenal medulla releases catecholamines such as epinephrine/norepinephrine.
Insulin promotes lowering/storage of blood glucose; glucagon supports raising blood glucose. Diabetes involves impaired insulin secretion, action or both.
Pineal gland produces melatonin. Ovaries and testes produce reproductive hormones. Many other tissues also secrete signaling hormones.
Endocrine disease matters through symptoms and complications: diabetes may involve neuropathy, wounds and glucose instability; thyroid disorders may affect energy, temperature tolerance and cardiovascular function. Massage does not “balance hormones” in a medically specific way.
Be able to identify the major structures, state their functions, connect the system to relevant pathology and explain how the information changes massage safety or treatment planning.