The anal swelling after meals is considered to be proctitis and dysentery. The patient with proctitis often shows pain in the lower abdomen, diarrhea and constipation alternately. In addition to proctitis, diarrhea and dysentery are also prone to localized bloating, and dysentery is mainly an intestinal disease caused by bacterial infection. Diarrhea causes patients to have a feeling of urgency, always want to defecate, but when squatting in the toilet, the discharge is less, always feel unclean is caused by the anal area swelling.