Depending on the duration of hair loss, close examination of the
scalp may reveal a higher than expected number of short
new hairs growing. This is because the hair enter the telogen phase. See the growth cycle of hair is in two phases, anagen or grwith phase and telogen or resting phase. During telogen, the resting hair remains in the follicle until it is pushed out by growth of a new anagen hair. In telogen effluvium, a large number of hair enter telogen at one time.