Perm or coloring can break hair and make it look thinner. Physiological changes can also cause hair loss. Childbirth, crash dieting and taking birth control pills all encourage hair to shed. Normal hair growth should resume after the condition is corrected.

Since it takes months for hair to show the damage caused by stress and trauma, it will also, in turn, take months to heal and regrow. Most of the damaged hair will have to fall out before new and healthy growth becomes obvious.

Regular exercise will help improve the condition of your hair. Physical activity reduces stress and increases the blood flow to the extremities, including the head and scalp.