Hair loss may be related to nutritional deficiencies such as B vitamins and proteins, as well as factors such as seborrheic alopecia and stress. 1. Lack of B vitamins: Vitamin B6, Vitamin B12, folic acid and pantothenic acid play an important role in maintaining healthy hair. b vitamins provide nutritional support to the hair, while folic acid and Vitamin B12 play an important role in the production of new hair cells. 2. Lack of protein: Because the nature of hair is keratin, the formation of hair melanin requires tyrosine as a raw material. Hair loss due to malnutrition is more common in dieting and weight loss populations. 3. Seborrheic alopecia: that is, androgenic alopecia, heredity and androgen are the main factors, which will also lead to hair loss. 4. Excessive mental stress: If mental stress is excessive, it will stimulate the scalp, resulting in excessive contraction of the erector spinae muscle, and over time, it will cause mental hair loss. And when the pressure is too high, the blood circulation at the scalp is also prone to problems, affecting the nutrition of the hair follicles, thus leading to hair growth. In addition hair loss may also be caused by other diseases, such as baldness, drugs, etc. If you have serious hair loss symptoms, you need to go to the hospital as soon as possible, by the doctor according to the specific conditions, to develop individualized diagnosis and treatment plan, so as not to delay the condition.