Massive hair loss may be seen in spot baldness, seborrheic alopecia, female postpartum alopecia and so on. 1. Patch baldness, also known as ghost shaving, is a sudden loss of hair caused by a variety of factors, including mental stress is the main cause of patch baldness, diabetes, high blood pressure and other underlying diseases are also important factors inducing patch baldness. 2. Seborrheic alopecia, also known as androgenetic alopecia, is the most common cause of male pattern baldness, especially among middle-aged and old-aged men, and the cause of this alopecia is directly related to the damage caused by dihydrotestosterone to hair follicles. 3. Postpartum alopecia is due to the fact that estrogen is at a lower level after childbirth, leading to massive hair loss. As estrogen secretion gradually returns to normal, this phenomenon usually lasts for about half a year and then gradually recovers. There are many other reasons for massive hair loss (such as neurogenic alopecia, physical hair loss), the specific circumstances need to go to the medical hospital, do not self-medication.