When the feces cannot be pulled out at the anal opening, it may be the phenomenon of constipation, but it does not exclude the existence of rectal malformation. 1. Constipation: usually due to improper diet, not pay attention to exercise and other factors, resulting in a small amount of feces, and accompanied by dryness and difficulty in defecation, so that the feces can not be pulled out at the anal opening. Symptoms can usually be relieved by the use of Ma Ren Lun Bowel Pills, Keserol and a diet rich in fiber. 2. Rectal malformation: Usually due to infection, developmental abnormality, trauma and other factors, the occurrence of rectal malformation, may also appear in the stool in the anus can not pull out the phenomenon. For patients with more serious conditions, surgery can be used as a treatment. When the stool can not be pulled out in the anus, there may be other causes, such as anal papilloma, rectal polyps, rectal tumors and other diseases, it is recommended that the patient go to the hospital for examination in a timely manner, and under the guidance of a professional doctor for treatment, to avoid delays in the condition, resulting in adverse consequences.