Which endocrine gland secretes the hormone, that, by under- or over-secretion, causes the disorder?

The endocrine gland that secretes the hormone responsible for a specific disorder can vary depending on the disorder in question. Here are a few examples:

1. Hypothyroidism: The thyroid gland under-secretes thyroid hormones (T3 and T4), leading to a sluggish metabolism and other related symptoms.
2. Hyperthyroidism: The thyroid gland over-secretes thyroid hormones, resulting in an overactive metabolism and associated symptoms.
3. Diabetes mellitus type 1: The pancreas fails to produce enough insulin due to the destruction of insulin-producing beta cells in the islets of Langerhans.
4. Diabetes mellitus type 2: Generally characterized by insulin resistance, the pancreas may initially produce normal to high levels of insulin, but the body's cells do not effectively utilize it.
5. Addison's disease: The adrenal glands do not produce sufficient cortisol and aldosterone, leading to fatigue, low blood pressure, and electrolyte imbalances.
6. Cushing's syndrome: Overproduction of cortisol by the adrenal glands or excessive use of corticosteroid medications can cause this disorder.
7. Acromegaly: The pituitary gland releases an excessive amount of growth hormone, leading to the enlargement of body tissues, especially in the hands, feet, and face.

It is important to note that different disorders can involve multiple endocrine glands or factors that contribute to their development. Consulting a healthcare professional is essential for accurate diagnosis and treatment.