The principal cause of hair loss rests on hereditary factors. It can occur very young or gradually with the passing of years.
The majority of the medical solutions are temporary and the treatment should be continued in a regular way. They are limited mainly to the finastride, the propecia, or the laser hair therapy.
Drug: Certain products like the finastride (propecia) and the minoxidil (kogain) can reduce hair loss and stimulate hair grow. However, they can cause side effects. Moreover, the stop of the treatment means the fall of the hair.
Laser Hair Therapy:

Laser Hair Therapy is a new non-surgical approach to treating hair loss, thinning hair, baldness and problems associated with the scalp. The treatment the laser is an effective technique and which made this evidence by using laser of low intensity what makes it possible to treat gradually, but effectively the loss of hair.
This new therapy is used in North America since 1997 but exists in Europe since 1970 and it is very useful when hair transplantation is not recommended: Such as menopause woman or men between 20 and 35 years.
The transplantation of hair constitutes a final solution. Indeed, because there is no phenomenon of rejection, because this are your own hair which is transplanted. The results last all you life.
The transplantation of hair is a effective , economic and permanent way to regulate baldness definitively! It does not require maintenance thereafter.