After running there are meat bumps in the anus usually because of hemorrhoids, rectal prolapse, anal papilloma and other disease causes. 1. hemorrhoids: hemorrhoids are usually caused by poor diet, constipation and other factors caused by anal and intestinal diseases, there may be anal swelling, blood in the stool, itching and other symptoms, but also may appear after running in the anus there is a lump of flesh, mostly because of hemorrhoids hemorrhoids nucleus prolapsed caused by the internal hemorrhoids. 2. Rectal prolapse: Rectal prolapse usually refers to the displacement of the whole or part of the rectal wall downward caused by external pressure, high abdominal pressure and other factors, usually with anal discomfort, falling, foreign body sensation, anal prolapse and other symptoms, but also may appear after running in the anus there are meat bumps of symptoms. 3. Anal papilloma: anal papilloma may be due to chronic inflammation, fecal stimulation and other reasons caused by the anal papillae hyperplasia and hypertrophy, usually there will be anal papilloma in the defecation prolapse, anal burning and other symptoms, but also may trigger the symptoms of the anus after running with lumps. There may be other reasons for the phenomenon of pimples in the anus after running, it is recommended that the patient should go to the hospital, to clarify the cause of the disease, under the guidance of the doctor to give treatment as soon as possible.