Mucus stool with anal swelling may be caused by ulcerative colitis, bacterial dysentery, internal hemorrhoids and other diseases. 1. Ulcerative colitis: when the intestinal tract is stimulated by long-term inflammation, it can lead to erosion of the mucous membrane in the intestinal tract, and the intestinal wall secretes more mucus, which leads to the emergence of mucus stool. At the same time, due to the stimulation of inflammation, leading to the emergence of intestinal hyperperistalsis, increased stool frequency, anal swelling and other symptoms. 2. Bacterial dysentery: when the intestinal tract is infected by dysentery bacillus, it can lead to bacterial dysentery, abdominal pain, diarrhea, mucus and blood stools and other symptoms. At the same time, it can also lead to a feeling of anal distension. 3. Internal hemorrhoids: when the hemorrhoids of internal hemorrhoids hemorrhoids volume is large, defecation, coughing and other actions can lead to increased abdominal pressure, resulting in hemorrhoids protruding from the anus and stuck in the anus, resulting in the anus is not tightly closed, and then anal distension, intestinal secretions out of the anus situation. If there is anal swelling mucus stool, it is recommended to go to the hospital in a timely manner, routine stool, anal fingerprinting, colonoscopy and other related examinations, to clarify the cause of the disease, under the guidance of the doctor to carry out targeted treatment, to avoid delays in the condition.