Anal swelling feeling feel a lump, may be due to internal hemorrhoidal prolapse, anorectal polyps, perianal abscess and other diseases caused by. 1. internal hemorrhoid prolapse: internal hemorrhoids will not come out in the early stage of the onset of the disease, along with the seriousness of the disease, the patient’s anal cushion tissue gradually relaxation, and the anal sphincter muscle tension is significantly weakened, may lead to internal hemorrhoids prolapse out of the anus, resulting in the feeling of anal distension, feel a lump, but also may be accompanied by local bleeding, pain and other symptoms. 2. Anorectal polyp: usually occurs in the rectal mucosa or anal canal mucosa, presenting a round or oval shaped swelling, during defecation due to intestinal peristalsis as well as defecation action implicated in the prolapse of the rectum is easily caused, resulting in a feeling of anal distension, touching the lump, may also be accompanied by blood in the stool, acute and severe symptoms. 3. Perianal abscess: usually due to the rectum and anal canal tissue, or the surrounding interstitial infection, due to the spread of infection, thus forming a perianal abscess, which will cause anal distension, feel a lump, may also be accompanied by severe pain, itching and other symptoms. The feeling of anal swelling and lumps may be caused by other reasons, so you should consult a doctor as soon as possible, and after diagnosing the cause of the disease through relevant examinations, you will be guided by a doctor to carry out the treatment to avoid any misunderstanding of your condition.