Telogen effluvium is a type of hair loss brought on by traumatic events such as serious illness, injury, or surgery, stress, or physiological shock to the body. Human hair has three different stages: anagen is the growth phase, catagen is the transitional phase, and telogen is the resting phase. Telogen effluvium occurs when a large number of hair follicles enter into telogen phase abruptly and begin to fall out.
Telogen effluvium is usually temporary. However, some people develop the condition chronically, particularly if the disease or disorder that caused it is chronic. In most cases, hair grows back three to six months after the event has ended or been rendered neutral. Sometimes, however, hair loss is delayed and does not begin until months after the stressful event occurs. The average amount of hair a person with telogen effluvium experiences is 30 percent, but some people lose as much as half. Seldom does telogen effluvium cause complete hair loss.
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