Sudden and severe hair fall can be improved by daily regimen and medication. Severe sudden hair fall may be caused by iron deficiency anemia, hypothyroidism, seborrheic alopecia, etc. Specific treatment needs to be chosen according to the cause. 1. Iron deficiency anemia: diet should be adjusted in time, consume more meat, eggs, animal liver and other foods. You can choose to use ferrous sulfate tablets, ferrous gluconate capsules, vitamin C tablets and other drugs for treatment under the guidance of professional physicians. 2. Hypothyroidism: pay attention to rest, you can choose to use levothyroxine sodium tablets and other drugs for treatment under the guidance of a professional physician. 3. Seborrheic alopecia: you can choose to use finasteride tablets, spironolactone tablets and so on under the guidance of professional physicians, and use selenium disulfide lotion, ketoconazole lotion and other medicines externally, and you can carry out hair transplantation, low calorie laser, fractional laser and other methods for treatment. You should go to the hospital in time for examination and diagnosis, and carry out targeted treatment under the guidance of professional physicians to avoid aggravation of the condition.