Internal hemorrhoids can lead to anal swelling. Internal hemorrhoids are mainly varicose veins, while the supporting structures that make up the anal cushion, such as fat, fibrous connective tissue and subvenous inhibition, lead to the occurrence of internal hemorrhoids. Once internal hemorrhoids occur, the rectal mucosal varicose will be more serious, and even hemorrhoids will come out of the anus and there is no way to subsume them, leading to a feeling of anal swelling in the patient. At the same time, because the surface of internal hemorrhoids is a mucous membrane layer with the role of secretion, the production of mucus and its fecal overflow will lead to perianal skin infection, so aggravating the feeling of anal swelling. Anal swelling may also be caused by external hemorrhoids, as the stimulation of fecal residue and its secretions can cause the patient to experience anal swelling, so internal hemorrhoids can cause anal swelling, but anal swelling is not necessarily caused by internal hemorrhoids.