The endocrine system is composed of glands in the body that produce hormones. These glands release hormones directly into the bloodstream, and the hormones regulate the functions of organs and tissues in different parts of the body. Many vital body functions—such as growth, development, reproduction, metabolism, and mood—are controlled by hormones.
Endocrinology studies and treats diseases of these hormone-producing glands and the hormones themselves.
The main areas endocrinology focuses on include:
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Pituitary gland: Produces hormones such as growth hormone, prolactin, and TSH.
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Thyroid gland: Produces hormones like thyroxine (T4) and triiodothyronine (T3).
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Parathyroid glands: Produce parathyroid hormone (PTH).
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Adrenal glands: Produce hormones such as cortisol, aldosterone, and adrenaline.
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Pancreas: Produces hormones like insulin and glucagon.
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Ovaries (in females): Produce hormones such as estrogen and progesterone.
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Testes (in males): Produce testosterone.
Common diseases treated in endocrinology include:
Since the endocrine system affects many body functions, endocrine disorders can lead to a wide range of signs and symptoms, such as fatigue, weight changes, sleep disturbances, mood swings, skin issues, and sexual dysfunction.