Wearing a hat for a short period of time does not usually cause hair loss, but if worn for a long period of time it can exacerbate the phenomenon of hair loss. If the hat is too tight, the scalp will be in a tight state, easy to press the head. This prolonged compression will make the blood circulation in the head is hindered, affecting the blood supply state of the head. Insufficient blood supply to the head will lead to a lack of blood nourishment of the hair, triggering the phenomenon of hair loss, especially the hairline moving back. And wear a hat hair long time airtight, will cause stuffy, sweating, with sweat more and more. Hair is in a moist and airless state, it is easy for bacteria to breed and aggravate the sebaceous gland oil secretion. If cleaned improperly, it will lead to hair follicle inflammation aggravating hair loss. It is recommended to choose a looser hat, and at the same time do not wear a hat for a long time. If the phenomenon of hair loss, go to the hospital in time.