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Hormones can be thought of as chemical messages that communicate with the body and bring about changes.

Hyperthyroidism can be diagnosed with a simple blood test that measures thyroid hormone levels.

The hormones leptin, insulin, oestrogens, androgens and growth hormone are factors in obesity.

An endocrinologist is a doctor who has special training to diagnose and treat disorders involving the endocrine system.

If the thyroid gland is overactive or sluggish, the metabolism will be affected, leading to a variety of symptoms.

Generally, pituitary tumours are benign and slow growing, and pituitary cancers are extremely rare.

The parathyroid glands make hormones that regulate calcium, phosphorus and magnesium in the bones and blood.

The pancreas helps to digest food, particularly protein.

Prolonged misuse of steroids can cause liver damage and severe mood swings.

Information about the hormonal or endocrine system, including fact sheets on glands, ovaries, pancreas, testicles, deficiencies and risks and management.