There are many reasons for thinness, first of all, consider for intestinal diseases, intestinal diseases will cause the human intestinal tract to external intake of nutrients malabsorption, malnutrition is one of the common symptoms of the crowd is thin, dark, need to treat gastrointestinal diseases can be improved. Secondly, it may be caused by improper diet, if the human body diet is not appropriate, it is easy to cause the human body to digest and absorb too little nutrients, too little absorption of nutrients will also lead to the human body to appear thin, need to improve the dietary laws and ways to ease. It may be caused by certain diseases, such as diabetes, the typical symptoms of diabetes are three more and one less, that is, eating more, drinking more, urinating more, and losing weight, due to the body’s weight loss will appear thin, and need to treat the original disease can be improved.