Androgenetic Alopecia - this is the commonest cause of hair loss in both men and women. It is commonly known as male pattern baldness. It is caused by a combination of 3 factors - Testosterone (the male hormone), age (after 20 years of age) and hereditary. It usually affects women later in life than men.
Alopecia Areata - this usually results in a patchy loss of hair. The exact cause is unknown.
Telogen Effluvium - diffuse loss of hair which may occur 2 to 4 months following childbirth or from high fever, acute illness, physical and emotional stress and crash dieting.
Chronic Illness - eg. iron and other dietary deficiencies. Thyroid diseases, syphilis and connective tissue disease are examples which may cause hair loss.
Scalp Diseases - fungal and bacterial infection, and other local scalp diseases.
Excessive traction on the hair - for example tight curling and hair styles (corn-braiding, pony-tails).
Drug Induced - anti-cancer drugs and anticoagulants are some of the drugs which may cause hair loss.