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

Cortisol helps to maintain blood pressure, immune function and the body's anti-inflammatory processes.

New life begins when a male sex cell (sperm) fertilises a female egg (ovum) within the female reproductive system.

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

Hypothyroidism means the thyroid gland is underactive which causes the person?s metabolism to slow down.

Polycystic ovary syndrome is a hormonal condition associated with irregular menstrual cycles, excess hair growth, acne, reduced fertility, and increased risk of diabetes and mood changes.

Hashimoto's disease progresses very slowly over many years, so the symptoms may go unnoticed.

The effects of androgen deficiency depend on how severe the deficiency is, its cause and the age at which the deficiency begins.

All men and women develop progressive patterned hair loss as they grow older.

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