There are many clinical reasons for teenagers to have gray hair, not necessarily caused by kidney deficiency, but other reasons can also occur. Teenagers’ hair is often dark and shiny because it contains a kind of melanin, the higher the melanin content, the darker the hair color; conversely, the lower the melanin content, the lighter the hair color. According to Chinese medicine, the appearance of gray hair is directly related to liver and kidney deficiency and loss of qi and blood, which is often one of the clinical manifestations of kidney deficiency. In addition to this, it is also possible that the patient has a chronic disease, which is also an important cause of gray hair in teenagers. Physiological causes such as mental factors, including prolonged depression, pessimism, and high academic stress, can also cause teenagers to grow gray hair. Teenagers should pay attention to relieving psychological stress, listen to soothing music, participate in outdoor activities, pay attention to regular work and rest, and ensure sufficient sleep. In the diet pay attention to eat more iron-rich food, such as animal liver, spinach, etc., to help the hair dark and shiny.