Anal bloating is a very common symptom in anorectal medicine, and there are many patients complaining of anal bloating in outpatient clinics. In addition to the male prostate and female pelvic adnexal problems, the most common cause of anal bloating is inflammatory lesions such as anal sinusitis and proctitis. The most common cause of anal swelling is inflammatory lesions such as sinusitis and proctitis. At the same time, internal hemorrhoids, internal rectal prolapse, external hemorrhoid prolapse, anal papillary hypertrophy, anal papilloma, anorectal neurosis, fecal impaction and low rectal polyps, rectal cancer and other anorectal diseases can have the feeling of anal swelling. The treatment should be carried out in a timely manner to avoid aggravation and deterioration of the condition. Even if it is an inflammatory lesion such as anal sinusitis, it should be treated in time, otherwise there is the possibility of developing into more serious diseases such as anal canalitis, perianal swelling and anal fistula.