Named After: Thomas Addison, a British physician.

A condition caused by adrenal insufficiency, leading to reduced production of cortisol and aldosterone. Symptoms include fatigue, hyperpigmentation, low blood pressure, and weight loss.

Named After: Harvey Cushing, an American neurosurgeon.

A disorder caused by excessive cortisol levels, often due to a pituitary adenoma or long-term corticosteroid use. Symptoms include moon face, central obesity, purple striae, and hypertension.

Named After: Hakaru Hashimoto, a Japanese physician.

An autoimmune disorder leading to hypothyroidism due to chronic inflammation of the thyroid gland. Symptoms include fatigue, weight gain, cold intolerance, and dry skin.

Named After: Paul Langerhans, a German pathologist.

Clusters of endocrine cells in the pancreas that secrete insulin, glucagon, and somatostatin. Dysfunction can lead to diabetes mellitus or other metabolic disorders.