The alopecia is a medical term that describes the finished or partial loss of hair.

The baldness is a word more colloquial that refers to the loss of hair, principally in the man, that tends to be of genetic origin but in that many other factors influence that purely hereditary.

With the age both the men and the women lose thickness in the hair. The men develop a typical model of baldness, which collaborates with the presence of testosterone (masculine hormone). In the women the model of baldness or loss of hair is more diffuse. Normally the loss of hair in the baldness is gradual and it limits itself to the hair of the head.

The baldness of typical hereditary tendency affects 25 % of the men before 30 years and other 50 % before 60 years.
It is necessary to bear in mind that the general average is to have more than 100.000 hair as person and in the baldness 100 hair can get lost a day.

Every hair has an average life from 4 to 5 years, grows between 1 and 2 cm a month, later it falls down. At the age of 6 months new hair grows in the same place, but in the baldness there exists a loss of the control of this substitution and for it the same one is evident. In himself it is not a fall of hair but an absence of exit of the new one.

When the causes are secondary (stress, medication, fever, etc...) the hair will return at his level when it stops the cause.
For the hereditary loss of hair or baldness there are used the minoxidil or the finasteride that are medicines that are used for other problems and illnesses, and it were observed that as side effect was producing hair excess. This side effect used appropriately in the scalp has a beneficial effect in stopping the baldness or in improving it, depending on every individual.

If the hair falls down of rapid form and without apparent cause it will have to consult it with his doctor.
His doctor will realize a general and hormonal analytical study to see possible primary and not hereditary causes.