The main considerations are related to perianal cysts, rectal prolapse, rectal polyps, early internal hemorrhoids, sinusitis and other diseases. 1. Perianal cysts: benign tumors, if the location of the abscess is deeper, local inflammation, inflammatory stimulation can cause anal distension without blood symptoms. 2. Rectal prolapse: when rectal prolapse occurs, part of the rectal wall will move downward, which will stimulate the anus and cause anal distension without blood in stool. 3. Rectal polyps: mostly found in the lower end of the rectum, causing the surface of the rectal mucosa to bulge, polyps can stimulate the rectum to cause the patient to have a bowel movement, which causes anal distension without blood in stool symptoms. 4. The early stage of internal hemorrhoids: mostly in a large amount of alcohol, spicy and stimulating food after the onset of the initial defecation, internal hemorrhoids may block the anal opening, resulting in anal distension without blood in stool symptoms. 5. Sinusitis: mostly seen in the anus, anal sinus and other parts of the local inflammation repeated stimulation can cause anal distension without blood in stool symptoms. Anal distension without blood in the stool, does not exclude other causes of these symptoms, so it is recommended that the above symptoms in time to go to the hospital to find out the cause of the disease, active treatment, so as not to delay the condition.