Because of the embarrassingly private location of the anus, many people generally do not take it to heart when discomfort arises and will not take the initiative to go to the hospital for treatment, not to mention that the anal opening is just a long bag, which has little impact on life. This idea is wrong, because many of the first symptoms of anal diseases are long bags! What are the diseases that may be associated with a bag at the anal opening? 1, internal hemorrhoids: a bag at the anal opening and also with blood in the stool, this may be internal hemorrhoids, internal hemorrhoids prolapse can be accompanied by blood in the stool, no obvious pain, but the bag can be self-returned, the development of late swelling generally can not be self-returned, you need to use your hand to hold back, to later with the hand can not be pushed back. 2.Thrombosed external hemorrhoid: pain is obvious, press the external hemorrhoid, there are hard nodes under the skin, purple-blue. 3, perianal abscess: perianal abscess can also cause a long bag at the anal opening, the patient first feels a small hard lump or swelling around the anus, followed by increased pain, redness and heat, swelling and discomfort, in about 1 week an abscess can form, and a soft, painful swelling can be felt around the anus. 4, rectal prolapse: prolapse during defecation, contraction after the stool can be self-recovery, prolapse stool surface for mucosa, but the prolapse is larger than hemorrhoids, there is a circular mucosal groove, while hemorrhoid prolapse is radial mucosal groove. 5, rectal polyps: prolapse during defecation, some can be self-returned, the surface is mucous membrane, mucous membrane inflammation is strawberry-shaped, some have a tip, some do not have a tip, often accompanied by the symptoms of bleeding. 6.Anal papillae hypertrophy: prolapse during defecation, part of it can be retracted by itself, part of it needs to be reset by hand, the surface of the prolapse is migrating anal canal epithelium, often with a tip, the surface of the stool rarely bleeds, but there is anal discomfort, no pressure pain, it can be one, or several. 7.Anal canal ectropion: occurs during defecation, the surface is covered with skin tissue, often accompanied by hemorrhoids and rectal prolapse.