3, malnutrition: iron deficiency anemia patients and those who are recovering from a serious illness, due to nutritional deficiencies are also prone to yellow hair phenomenon; 4, endocrine diseases: such as hypothyroidism is prone to yellow hair phenomenon, need to go to the hospital for trace element examination or treatment; 5, improper hair care: washing hair too often, using alkaline soap to wash hair, frequent perming and dyeing, etc. can damage the hair. Frequent use of hair dryers, etc. will damage the hair, causing the tyrosinase dysfunction in the hair follicle area, resulting in yellowing and withering hair; 6, do not pay attention to sun protection: excessive ultraviolet radiation will make the keratin in the hair denaturation, prone to dry hair, hair brittle, easy to fall off.