Most people lose about 50 to 100 strands of hair each day. Yet, the thinning of scalp hair is almost unnoticeable owing to the simultaneous hair growth filling up the vacant spots. But permanent hair loss occurs if the cycle of shedding and growth is disrupted or the hair follicle is damaged and substituted with a scar tissue. Few possible causes can be- Genetic factors- Genetic factors bring about gradual hair loss in both the sexes; resulting in bald spots and a receding hairline in men and the thinning of hair among women. Hereditary factors also determines the age at which you could start losing hair.