Telogen effluvium

This condition occurs when the growing phase of the hair is interrupted prematurely causing the hair follicles to enter the telogen (resting) phase of the hair cycle earlier than normal. Two to four months later, following the normal cyclic pattern, diffuse shedding of the hair begins. When this happens there are not enough hairs left in the anagen phase, or growing phase, and the result is therefore diffuse thinning of the hair.