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

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

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

Hirsutism in women is the excess growth of dark and coarse hair over areas of the body where it ordinarily wouldn’t grow, such as the face and back. About one woman in 10 is affected.

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

There is generally no cure for an autoimmune disorder, but the symptoms can be managed.

Having a vasectomy does not affect a person's ability to produce sex hormones, enjoy sex or reach orgasm.

Congenital adrenal hyperplasia (CAH) can affect a child's normal growth and development, including normal growth of the genitals.

Migraine causes a severe and throbbing headache, usually on one side of the head, as well as symptoms such as nausea.

Exercise can prevent age-related changes to muscles, bones and joints and can reverse these changes too.