On average, we have 100,000 hairs on our scalps, of which, most adults lose approximately 75-125 hairs per day due to natural processes of the hair going through the hair cycle.
There are many causes of hair loss in men and women. However, the most common cause of hair loss in men is hereditary androgenetic alopecia, more commonly known as “male pattern baldness”. The culprit hormone causing the problem is dihydrotestosterone (DHT).
Similarly, females presenting with hair loss commonly have hereditary female pattern hair loss. There are other causes of hair loss that is medically treatable, such as thyroid disease, iron deficiency, childbirth, nutritional deficits, ill health, and certain medications. Stress can also accelerate already genetically programmed hair loss. Other causes include scaring alopecia and alopecia areata from autoimmune diseases such as lupus.
Hair loss is NOT caused by clogged hair follicles, frequent shampooing, wearing of hats or helmets.
As people age, some degree of hair loss occurs and the total hair volume will decrease over time in both sexes.
The tendency for male and female pattern hair loss is genetically inherited from either side of the family and begins to develop after puberty. The hair on the scalp in people with androgenetic alopecia (usually in the crown and frontal hairline) starts to shrink in its shaft diameter each “life cycle”, until it eventually disappears.
The hair on the back and sides of most men’s scalps is usually genetically “permanent” hair. They are not affected by DHT and is set to remain throughout that man’s lifetime. Hair in this area is very important in hair transplantation as transferring the hair to other bald areas of the scalp creates new, permanent hair growth.