The painful stomach always has the urge to defecate and sometimes cannot be defecated, which is commonly caused by proctitis, intestinal polyps, intestinal tumors, perianal abscesses and other diseases. During an attack of proctitis, the rectal mucosa will become inflamed, congested and edematous, which will cause the patient to have a feeling of abdominal cramping. Due to the inflammatory stimulation, the patient will have the urge to have a bowel movement, but no feces exists in the rectum, so he or she will not have a bowel movement. The attack of intestinal polyp will cause local irritation and inflammation in the intestine, resulting in a feeling of urgency, and therefore, a feeling of bloating and bowel movement. Intestinal tumors are malignant diseases that can damage the mucosa and even cause protein decay, which affects the function of the intestine and can cause a feeling of urgency when the disease is advanced. During an attack of perianal abscess, there will be edema and congestion around the anus, and the patient will also have a bowel movement due to the irritation around the anus.