Generalized hair loss - resulting from certain illnesses and infections, vitamin deficiencies, as a side effect of medication or medical treatment, and following exposure to toxic substances - is usually temporary. Because these processes do not damage the hair roots, hair will regrow in the vast majority of people.
Patchy hair loss caused by ringworm is easily reversed with anti-ringworm treatment. Patchy hair loss caused by alopecia areata cannot be cured, although the condition usually clears completely by itself within six months to a year.
Balding in men is normal, and no treatment is required if the person is comfortable with the appearance. Treatments for this condition are designed to reverse the normal and natural course of events. Ways to restore hair in men who are balding include: