Yin deficiency and yang deficiency may cause constipation, both belong to the deficiency of constipation, but yin deficiency and yang deficiency caused by constipation in the accompanying symptoms and treatment, there are certain differences, can be distinguished. 1. Yang deficiency: Yang deficiency constipation is mainly due to kidney yang deficiency, qi powerlessness, the patient is often accompanied by urination and constipation, lumbar and knee soreness and weakness, frequent urination at night, hands and feet not warm, face 晄white, etc. The treatment should not blindly use laxatives, but should not be used to treat the symptoms of constipation. Treatment can not be blindly laxative laxative, can be used to warm the kidney and essence, laxative method. 2. Yin deficiency: Yin deficiency constipation is mostly caused by deficiency of fluid in the late stage of febrile illness or old age, especially the lack of intestinal fluid without moistening, and patients are often accompanied by symptoms such as heat in the hands and feet, red face and hot flashes, palpitations, and dryness of the throat and mouth, etc. The methods of nourishing yin and promoting the production of fluids and nourishing Yin and moistening the dryness (nourishing yin and removing the heat evils) are mostly used to pass the bowel movement. If the patient is constipated for a long time, it is recommended that the patient consults a professional Chinese medicine practitioner for diagnosis and treatment, and combines with auxiliary examination if necessary.