There are more factors for the appearance of gray hair at the age of 30. Hair color is mainly related to melanin, normally, with the gradual increase in age, some people from 30-40 years old, the melanin in the hair begins to reduce, and gray hair appears. In addition, such as mental, dietary and nutritional factors can accelerate the process of hair graying, combined with other special diseases, hair graying also occurs. 30-year-old people appear poor mental state such as long-term mental tension, anxiety, depression, excessive brain, etc., or poor eating habits, including picky food, partial eating habits or long-term hunger, etc., may trigger the pigment cells work disorders, affecting the melanin The production of melanin is slow and insufficient, which will accelerate the production of gray hair. These people need to improve their habits and adjust their emotions in time to slow down the growth of gray hair. The endocrine system diseases such as hyperthyroidism or hypothyroidism can cause endocrine disorders, further triggering abnormal pigment cell function; consuming diseases such as tumors, tuberculosis, etc., can cause malnutrition, insufficient melanin synthesis, vitiligo patients with lesions affecting the hair, can appear at the age of 30 years old gray hair, need to promptly identify the cause, the cause of treatment.