Anal swelling and pain after defecation is considered to be caused by the following situations: 1, it may be caused by the aggravation of hemorrhoids, especially after the hemorrhoid nuclei of internal hemorrhoids are enlarged, prolapse, anal swelling and other symptoms.2, it may be caused by perianal abscess, which is caused by acute infection and other situations, there will be a local sense of pain on pressure, swelling, hardness to touch, and a fluctuating sensation due to the presence of pus in the inside, there may be a fever, and also There may be fever, and in severe cases, it may reach about 40℃.3. It may be caused by recent recurrent diarrhea, due to the weak skin around the anus, repeated fecal stimulation as well as wiping will make the perianal tissues feel distended and painful. In addition, it can not be ruled out is caused by anal fistula and other conditions, it is recommended to go to the hospital in time to do further examination, diagnosis and then treatment.