Physical alopecia

Including mechanical alopecia, burns and radiation injury of hair loss and alopecia. Mechanical alopecia is caused by some particular hairstyle or hair break off, such as women's braids, hair and other hair type, hair type, and so the sub-men. Hair is required to maintain a certain degree of natural canopy loose and the right pressure to keep the appropriate flexibility, if directly affected by the rally, tie tightly with ribbon or rubber bands together, likely to cause hair to break off his forehead, the hairline back. Excessive exposure to sunlight in the ultraviolet, frequent use of hot hair, the hair can easily become scarce. Clinically, radiation injury is divided into four degrees, can cause hair loss.