Headlines can be caused by heredity, bad habits or aging. 1. Heredity: Headline is affected by genetic factors, if one of the parents has headline, the chance of children having headline will increase. 2. Bad habits: If you have the habit of frowning, it will damage the restoring power of forehead muscles in a long time, which will lead to the elasticity of forehead skin fibers decreasing, and thus the appearance of forehead lines. 3. Ageing: with the growth of age, the differentiation speed of skin cells becomes slower and slower, which will lead to more and more loose skin tissues, so it will lead to the loss of skin elasticity, and in the long run, it will form head lines. In daily life, we must do a good job of skin care, pay attention to skin moisturizing, which can effectively maintain the elasticity of the skin, so as to reduce the occurrence of head lines.