There has been a ring of swelling in the anus, and the swelling becomes larger after squatting, which may be hemorrhoidal prolapse, rectal prolapse or tumor and other diseases. 1. hemorrhoids: is a relatively common anal and intestinal diseases, blood in the stool, pain, anal mass and mass prolapse and other symptoms are hemorrhoids more common phenomenon. Hemorrhoids mass can also be a circle of continuous prolapse and squatting after the increase, such as the third stage of mixed hemorrhoids, mass continued to prolapse outside the anus and can not be sent back to the anus with the hand, that is, ring mixed hemorrhoids, the need for early surgical treatment, to avoid incarceration, ischemia, necrosis. 2. Rectal prolapse: the rectal wall or part of the downward shift, serious cases can continue to prolapse outside the anus, and into a round, soft mass. When constipation, abdominal pressure increases, such as squatting, coughing, breath holding and so on, the prolapsed rectum will increase. 3. Tumor: the growth of anal or rectal tumor, the same will appear such symptoms, but less common. There has been a circle of swelling in the anus, and the swelling becomes bigger after squatting, it is recommended to go to the regular hospital in time, make a clear diagnosis and give standardized treatment.