Damage of pituitary gland that stimulates the thyroid gland, sex glands and adrenal cortex also result in hair loss. Excess formation of male hormones due to any of the disorders can be a cause of hair fall. Heredity may also play an important role. Most popular theory of alopecia areata states it as an autoimmune disease where the immune system of the body attacks the hair follicles. Inadequate calories and insufficient protein intake will affect your hair, if you are on a crash diet to loose your extra weight.
Hair loss can occur.
In anorexia nervosa, a psychosomatic problem associated with refusal to eat an adequate amount of food may also affect hair. Severe psychic stress results in sudden loss of hair. Biological stress is a more common cause of sudden hair loss. Any number of surgical operations, haemorrhage or shock associated with an accident can cause it. There are number of mechanical stresses on the scalp and hair that can cause hair loss.