Hair shedding, or telogen effluvium, occurs when large sections of hair fall detach from the scalp. This can be caused by several conditions, including stress, surgery, high fevers, blood loss, hormonal change, and childbirth. Hair shedding is a common side effect of some chemotherapy drugs.
If you’re experiencing hair shedding, a trichologist might be a good place to start. They should be able to direct you to a physician who can help you with underlying conditions.