Abdominal pain without defecation is considered to be caused by constipation, intestinal obstruction, intestinal tumor and other diseases. 1. Constipation: Constipation is a common clinical disease, mainly manifested as a decrease in the number of bowel movements, hard and dry feces, etc., and the patient will also have the symptom of abdominal pain. The causes of constipation are many, mainly divided into organic constipation, functional constipation. 2. Intestinal obstruction: Intestinal obstruction is the obstruction of passing intestinal contents caused by various reasons, patients will have abdominal pain, constipation and other symptoms, intestinal adhesions, tumors, intestinal inflammation, etc. are the main causes. 3. Intestinal tumor: Intestinal tumor is benign and malignant tumor occurring in small intestine and large intestine, if the tumor is large in size, it will block the intestines and cause constipation, and some patients will also have abdominal pain and other symptoms. There are many reasons for patients to suffer from abdominal pain but not defecation, so it is recommended to go to the doctor for relevant examination to make a clear diagnosis.