Hair thinning and softening hair loss serious, may be dietary factors, mental factors, seborrheic alopecia, may also be caused by other factors. 1. Dietary factors: long-term partiality, picky eating, resulting in a lack of nutrients. Frequent overeating leads to poor digestion and absorption, and the lack of nutrient supply to the hair follicles may lead to hair thinning and hair loss. 2. Mental factors: long-term irregular work and rest, emotional anxiety, depression, stress, overwork, poor sleep, will also have an impact on the growth of hair, resulting in fine hair. 3. Seborrheic alopecia: Seborrheic alopecia, also known as androgenic alopecia, is directly related to heredity. Androgen stimulates hair follicles to shrink, and most of the patients have obvious family history of heredity, which may lead to thinning and softening of the hair and gradual shedding. 4. Other factors: postpartum alopecia, menopausal alopecia, as well as lupus erythematosus and other connective tissue diseases, can lead to thin and soft hair, and there may be symptoms of hair loss. It is recommended to improve bad habits, relaxation, light diet, quit smoking and alcohol, if necessary, to the hospital dermatology department to seek the cause, for the cause of the treatment.