Repeated anal swelling is mainly caused by diseases, common diseases include hemorrhoids, perianal abscess, rectal cancer, etc., need to go to the hospital in time to identify the cause. 1. Hemorrhoids: Hemorrhoids is the lower end of the rectum or the anal canal blood swollen venous plexus, often divided into internal hemorrhoids, external hemorrhoids and mixed hemorrhoids. Often associated with constipation, obesity, poor defecation habits, when the hemorrhoidal nucleus from the anus out or embedded in the anus, the patient is often manifested as a recurring sense of anal swelling. 2. Perianal abscess: Perianal abscess refers to the acute purulent infection of the tissues around the anal canal and rectum, which is mainly related to the infection of the anal crypt. When the infection spreads to the anus, it can lead to pain and lumps around the anus, which will lead to swelling sensation. 3. Rectal cancer: rectal cancer is a relatively common malignant tumor of digestive tract, and the symptoms of rectal cancer are related to the invasion location and size. When the cancer breaks and bleeds, the patient will show acute and severe pain, recurrent anal falling sensation, etc. When the patient has anal falling sensation, the patient will have anal swelling. When the patient has discomfort in anus, he/she should go to the hospital for examination immediately to get a clear diagnosis and give appropriate treatment according to the doctor’s instruction to avoid aggravation of his/her condition.