Hair loss is when more head hair is lost than regrown. Human bodies are covered with hair. Each hair grows every month and keeps on growing until it falls out and another grows in its place. It is normal to lose about 50 to 100 hairs every day. From a physician's perspective, hair loss is not a medical problem. However, losing hair can have a big cosmetic impact. This is why many people find hair loss difficult to come to terms with.
Male pattern baldness is a hereditary condition that is caused by oversensitivity to a hormone known as dihydrotestosterone (DHT). Hair loss can begin in teenage years, but it more commonly occurs in adult men. Some men only have hair loss in certain areas, others go completely bald. An estimated 25% of men will have noticeable hair loss by the age of 30, and an estimated 66% will have visible hair loss from the age of 60. Female pattern hair loss is quite common during menopause and is characterised primarily by a decrease in hair density over the top of the scalp. This form of hair loss is an inherited condition too, and to some degree occurs in approximately 50% of women.
Hair loss can also be caused by alopecia areata which is an autoimmune disease caused by the body attacking its own tissue. Alopecia can be caused by use of some medicines, severe stress, chemotherapy and iron deficiency.