The anus has a sense of falling with back pain, need to consider several aspects of the disease: 1, intestinal disease is the main cause of anal falling sensation, when there is inflammation in the rectum, inflammatory factors can directly stimulate the rectal wall, so that the center of defecation excitation stimulate rectal defecation, thus producing a sense of falling, may be hemorrhoids, especially internal hemorrhoids, in the internal hemorrhoids will occur when there will be a significant prolapse produce anal falling sensation, and at the same time hemorrhoids prolapse will also make the anus At the same time, prolapsed hemorrhoids will also obstruct the return of blood to the anus, venous stasis and dilation and over-expansion of the veins will stimulate the rectum to produce a sense of defecation, anal falling. 2, the main cause of back pain is urinary system diseases, such as kidney stones or upper urinary tract infections. 3, need to additionally consider pelvic inflammatory disease, when the pelvic cavity is infected with inflammatory factors will stimulate the pelvic floor to produce a sense of defecation, which may be accompanied by systemic symptoms, such as low-grade fever, easy to fatigue, low back pain, often around menstruation and worsened. It is often aggravated before and after menstruation.