Hair loss during pregnancy is a phenomenon that occurs in many women during pregnancy, and there are two main reasons why it happens: First, during pregnancy, the hormone level in the body, especially the estrogen level changes compared to the normal state, and many hairs synchronize into the resting phase, causing hair loss. Second, many women do not rest well during pregnancy, have pregnancy reactions, or in late pregnancy, rest cannot be effectively guaranteed or sometimes have emotional irritability, etc., may also appear the phenomenon of hair loss. Generally in about six months to a year after delivery, can gradually return to normal, do not need to worry about special.