The itchy feeling inside the anus after a bowel movement may be caused by hemorrhoids and proctitis. 1. hemorrhoids: generally due to pathological hypertrophy of the anal cushion, displacement, and perianal subcutaneous vascular plexus blood flow stagnation of the formation of masses, manifested as blood in the stool, anal swelling prolapse, anal swelling and pain, foreign body sensation, itching and other symptoms. 2. Proctitis: generally due to various causes of inflammatory diseases of the rectum, manifested as blood in the stool, anorectal pain, abdominal pain, diarrhea, constipation, itching and other symptoms. After the stool inside the anus feel itchy first of all to determine the cause of the disease, in general, you can use drugs for treatment, when the problem is serious need to go to the hospital in a timely manner, to clarify the cause of the disease, and listen to the doctor’s advice for treatment.