Hemorrhoids can sometimes cause anal swelling, such as when internal hemorrhoids occur in the internal dentition line, prolapse out of the anus, or when there is inflammation in the nucleus, as follows: 1. Internal hemorrhoids occur in the internal dentition line: internal hemorrhoids occur in the internal dentition line, and sometimes internal hemorrhoids with blood clots or inflammation can increase in size and stimulate the nerves around the dentition line, which can cause anal swelling. 2. Internal hemorrhoids prolapse out of the anus: internal hemorrhoids can prolapse out of the anus at a certain stage of development. The nucleus of the prolapsed hemorrhoid will be swollen and painful, stimulating the nerves around the anus and causing anal swelling. 3. Inflammation of the nucleus of the hemorrhoid: The surface of the prolapsed hemorrhoid sometimes becomes inflamed and there will be inflammatory exudate, stimulating the perianal area and also causing anal swelling. After the internal hemorrhoid is prolapsed, you should use external hemorrhoid cream, use hemorrhoid plugs to nano-anal, use potassium permanganate for anal fumigation, sitz bath, after the internal hemorrhoid swelling subsides and pain disappears, it can be returned to the anus, and the anal swelling will disappear. Patients should usually pay attention to their diet, avoid spicy and stimulating foods, eat more fresh vegetables and fruits, drink more water, and keep the area around the anus clean and hygienic. In addition, do not be sedentary, should strengthen physical exercise, keep a happy mood, and have a regular routine.