The first point may be due to the sensation of anal cramping caused by proctitis, which is not caused by stool but by inflammatory stimulation and swelling. The second point may be due to dry stools caused by long-term diet and other habits, resulting in difficulty in defecation and damage to the mucous membrane of the anal skin, and repeated anal fissures resulting in scar contracture of the anal skin, which leads to anal stenosis. The third point is due to family genetic factors or environmental factors leading to anorectal cancer tumors, which mostly have mucus-purulent stools, blood in the stool, and sometimes some systemic symptoms such as rapid weight loss. The fourth point is common constipation due to spicy diet stimulation or less water, or several days without bowel movement, may lead to such a situation.