The common causes of stoma bleeding are as follows: 1. It may be due to the dislodgement of the ligature of the small mesenteric vein during surgery, which may cause bleeding symptoms. 2. It may be due to external injury to the mucosa of the stoma or friction of clothing, which may lead to wounding. 3. It is considered that the capillaries at the mucosa of the stoma are oozing blood. 4. The stoma bleeds because the patient has a systemic coagulation disorder. In addition, the bleeding may be caused by the patient’s recent use of anticoagulant medication. Once bleeding from the stoma occurs, it should be taken seriously and the patient should go to the hospital to inform the doctor for further hemostasis or anti-infection treatment.