A part of patients with cystitis will cause anal swelling, just a very small part, a relatively small proportion. The most important symptoms of cystitis are urinary frequency, urgency, urinary pain, presenting bladder irritation signs, and a part of the patients will cause anal distension because the bladder and the rectum are both part of the pelvic system. Inflammation of the bladder, inflammation can spread in the pelvis, can lead to urethritis or proctitis, sinusitis and cause anal distension, is also a very small part. If you are experiencing anal swelling, it is important to treat cystitis. Because anal swelling is caused by cystitis, some patients will also experience relief from anal swelling by treating cystitis. The most common treatment for cystitis can be oral levofloxacin, which is more serious, or some people want to have a quick effect on the treatment, you can use levofloxacin IV. Local anus can be used, such as metronidazole or tinidazole plug anus, through the local direct treatment, to play a role in relieving anal swelling. In addition, you can also with Chinese medicine bath, such as hemorrhoids comfortable wash, can be localized bath, infiltration in the perianal area and play a local absorption of the therapeutic effect.