The causes of hair loss are usually malnutrition, mental and psychological factors and pathological factors. 1. Excessive weight loss, long-term dietary imbalance caused by malnutrition: hair can not get enough nutritional supply will gradually become thin and soft, and when serious, there will also be hair loss, the patient should be scientific nutritional diet, in order to improve their own body nutrition level. 2. Mental and psychological factors: if the work and life stress, there will be anxiety, tension and other negative emotions, and hair is also prone to thinning and soft, hair loss symptoms, so adjust the rhythm of work and life, appropriate relaxation will help to improve this symptom. 3. Pathological factors: some pathological factors can also lead to hair softening and thinning hair loss, such as seborrheic dermatitis, and other symptoms include itching, erythema or greasy scales. In serious cases, it is recommended to go to a regular medical institution in time, and follow the doctor’s instructions for medication and standardized treatment.