Hair: how to assess the fall?

The loss of hair regardless of the reason may be more or less disturbing, it speaks of alopecia when this loss is significant and determines areas more or less extensive thinning or no hair.
If the absence involves all the hairs of the body it comes to alopecia universal, if every human scalp we speak of total alopecia, but if it is confined to the scalp it comes to partial alopecia.
And ‘this is the case in which androgen tic of alopecia involves mainly the upper portion of the head and attachment hair on the forehead with the neck savings.
There are varying degrees of androgen tic alopecia that were classified clinically in various ways.  The classification used is that of Norwood Hamilton, which divides the male alopecia in 7 stages of evolution: the initial stage corresponds to stage i, baldness stadium vii.