Patients with left abdominal distension and constipation may be caused by constipation, intestinal diseases and gynecological diseases, which can be treated by non-pharmacological, pharmaceutical and surgical means. 1. Constipation: If the patient can not pass stools for a long time, the left abdominal distension and pain may occur. The patient can drink more water, eat more food to promote defecation, such as bananas, celery, etc., and take diarrhea-inducing drugs as prescribed by the doctor, such as Lactulose Oral Liquid, Polyethylene Glycol Electrolyte Dispersant. 2. Intestinal diseases: such as rectal cancer, colon cancer, etc., left abdominal pain and constipation may also occur, which can be treated mainly by surgery, and combined with radiotherapy, chemotherapy and other ways of auxiliary treatment. 3. Gynecological diseases: If the abdominal pain is not relieved after defecation or there is no constipation before the occurrence of abdominal pain, it is considered that there may be gynecological tumors, which should be consulted in hospital in time and treated by surgical resection. Left abdominal distension, constipation, there are other reasons, it is recommended that patients go to the hospital in a timely manner to improve the examination, clear diagnosis and symptomatic treatment.