Telogen effluvium is a type of hair loss that occurs when a large number of follicles on the scalp enter the telogen phase of the hair growth cycle but do not enter the next growth phase. Hair falls out all over the scalp as a result, with no new hair growth. Telogen effluvium does not usually result in total baldness, even though you may lose 300 to 500 hairs per day and your hair may appear thin, especially at the crown and temples.