The life cycle of hair is ordinarily around two to three years. It will differ according to the person and their stage of life, but whatever the rate, not all your hair is growing at any one time. Around ninety per cent of hair follicles will be growing. Hair is lost as part of the natural growth cycle.
Hormones
Certain hormones can affect hair growth. Overactivity or underactivity of certain glands may lead to more hair being lost than normal. The balance between testosterone and oestrogen can play a part and it is sometimes the case that women will lose hair after giving birth as hormone levels may be out of balance at this time.
Disease
Diabetes can cause hair loss, but skin problems are a major cause as hair follicles are situated within the skin. Many skin problems can be easily treated with medication, although it is also the case that certain other forms of medication can actually cause hair loss.
In any case of hair loss, it is important to get a proper diagnosis before undergoing any form of treatment. Your GP may refer you to a dermatologist who may be better able to advise you.