Hair loss typically caused by radiation therapy or chemotherapy. These procedures disrupt the anagen cycle. Hair usually breaks off rather than sheds.

Significant loss of hair during the anagen (growth) phase.

Hairshafts are produced by follicles within the skin in all but few locations viz: palms soles, lips, eyelids, backs of distal phalanges and parts of the external genitalia. Each productive hair follicle provides hairshafts throughout the life of the person. Some follicles may intermittently produce vellus or terminal hairshafts.

loss of hair during the anagen or growing phase. It is commonly associated with chemotherapy or radiation treatment.

Loss of hair that is supposed to be in the anagen or growing phase. This is the type of hair loss that is associated with chemotherapy or radiation treatment.

The condition of hair loss that is caused by medications that poison the hair follicle. A common medicine that causes hair loss due to anagen effluvium is chemotherapy.