Growth and metabolism of hair:
Generally speaking there are 10-15 hundred thousand pieces of hair on scalp. Hair grows from sac cavity under scalp and the micro vessels provide nutrition with it. So every piece of hair is individual and it has its own growth condition and growth circulate. Ninety percent of the hair keep growing for a period of 4-5 years or so. And the rest have a rest for a period of 2-4 months .Then the aged drop at the same time the new come up. As human body's normal metabolism reaction is concerned hair's drop is normal. The aged hair drop so that the new can come up. Normal person drop 100-150 pieces of hair and the new will come up at the same rate so the total is definite.

What is male alopecia?
Male alopecia is also named as beforehand alopecia, alopecia caused by fat overflow, familial alopecia, alopecia caused by male hormone etc. Hair generally drop; temple move back quickly; front hair fringe rise up; hair on vertex is getting thinner till alopecia; and it aggravate gradually. Alopecia on vertex and forehead are connected for some serious patients. There is only more than a half circuit of hair around head distributed like horse hoot are still alive.

The cause of male alopecia morbidity:
1) Male hormone
The morbidity of alopecia has a certain and close relation with male hormone in the human body, so it is also called alopecia caused by male hormone. It is studied that the level of 17-acetone genus solid alcohol and testis acetone in the blood between the patient and the normal is equal. So it may be caused by the increasing sensibility of the hair sac to the male hormone. At present it is generally regarded the male hormone is one of the main factor of male alopecia but the working mechanism is still uncertain.
2) Heredity factor
It is called familial alopecia for it has heredity trend. Recently it is regarded as multiple factor and multiple gene heredity. In other words male alopecia is caused by the interaction of some gene and condition factor.
3) Mental factor
Abnormal mental condition will affect human nerve system and endocrine system. Then it change systemic and part factor concerning with the growth of hair. At last it affect the normal growth of hair. It is proved that the patient of male alopecia is in the state of serious depression and inquietude. They are often apt tired, sleepless, furious and disquiet So the abnormal mental condition and the male alopecia interact and lead to vicious circle.

What is alopecia?
It is normal dropping 50-60 pieces of hair one day. The quality over 100 is the sign of alopecia.

The proportion of the alopecia:
Male alopecia is global dermatology problem. There are 5,000,000 male patients in America. Over 95 percent is male alopecia and 70-80 percent of them have inheritance history. It is statistic that 1/4 adult man in Shanghai are bothered by alopecia.

Does the male alopecia affect individual charm?
Man who want to seek ideal mate maybe begin with the head. An investigation was made by Social Technology Academy of HongKong University. They visited 545 women between 18-40 years old what conditions their ideal mates should possess, especially the expectation of their appearance. It is showed that 81 percent of the visited women will think about appearance. While over 90 percent

Does the male alopecia affect their positions?
The studied about 520 White governors，senators and congressmen and found then proportion of alopecia is much lower than the contemporary white man. Perhaps the voters preferred the dense-haired candidates or the dense-haired candidates showed more confidence to contend the public office.
In fact these reflected the social mental pressure of some alopecia patients.

Attention on female alopecia
The cause of female alopecia:
Women drop some hair when they do some bombing everyday is called metabolism, and it is normal. In early Spring and late Autumn over one hundred pieces of hair's drop is also normal. Because of the excretion of female hormone physiological condition cannot easily be equilibrated.
If the condition is even worse you'd better take it into account. Generally speaking the female alopecia is caused by the reasons as follows:
1) Postpartum:
The hair has plenty of growth hormone because human body can excrete a lot of female hormone when they are pregnant. Hair drop aggravate naturally when they are postpartum. The situation will disappear after six months or so.
High fever：High fever especially constantly high fever can also destroy hair root tissue and lead to hair drop. Nevertheless it will come back to normal after six months or so.
2) Pressure:
The pressure is increasing because of the acceleration of modern social living tempo and acute competition. It is proved that pressure not only have close relation with alopecia but also accelerate aging and wrinkling. So you must relax and disburden yourself thoroughly.
3) Diet:
Nutrition is absent because of diet. Hair will be drab and alopecia. So you should equilibrate your diet construction and not to go on a diet blindly.
4）Contraceptive:
Women often take contraceptive also being alopecia. Alopecia will disappear if you do not take it.
5) Perm and dye frequent:
Perm and dye frequent will destroy you hair even lead to alopecia. So you should not perm frequently or misapply kinds of colorant.
6) Effect of hair pattern:
If you often tie up you hair tightly it will destroy your hair and lead to alopecia.
7) Effect of disease:
Some disease like skin gland's over excretion or character change can lead to alopecia.
Furthermore alopecia parts gather in the forehead and two sides so you'd better drag your hair when you bomb. And you should not blow your hair for long or your hair natural protect layer will be destroyed then your hair will be drab and fragile.