Periumbilical pain and mucus discharge may be due to acute gastroenteritis, ulcerative colitis, intestinal tumors and so on. 1. Acute gastroenteritis: pain around the umbilicus, often caused by unclean diet or viral infection, stimulates the gastrointestinal mucosa and mucus stools. 2. Ulcerative colitis: chronic inflammatory lesions of the colon caused by various reasons, with clinical manifestations of periumbilical pain and mucus stool. 3. Intestinal tumor: after suffering from intestinal tumor, the tumor will stimulate the surrounding mucosa and cause inflammatory lesions, which will lead to pain around the umbilicus and mucus stool. There are many other reasons for the pain around the umbilicus and mucus discharge, patients should go to the hospital in time, complete the relevant examination, after clarifying the cause of the disease, and then use medication under the formal guidance of the doctor.