Pain in the anus attached to the bowel is mainly caused by lesions in the intestines, especially those occurring at the end of the rectum, which mainly include anal fistula, rectal polyps, and acute enteritis. Anal fistula symptoms can lead to anal as well as intestinal pain. Acute inflammatory lesions in the intestines due to fecal or bacterial infections can form a fistula that connects the rectum to the skin around the anus over time, and sometimes pus or blood will flow out of the fistula, causing pain in the anus and intestines. Rectal polyps can also lead to the emergence of this symptom, due to bacterial or viral infections, resulting in rectal mucosal edema, severe detachment from the intestinal wall, which causes the end of the rectum associated with the anal region of the phenomenon of pain. In addition, poor diet and other causes of acute enteritis and other symptoms, will lead to abdominal pain and diarrhea symptoms, and lead to intestinal mucosal congestion and anal edema, thus leading to pain in these parts of the connection.