The perineal swelling may be related to physiological factors, or it may be caused by hemorrhoids, gynecological inflammation and other reasons. 1. Physiological factors: During menstruation or late pregnancy, obstruction of venous return leads to pelvic congestion, which may lead to perineal swelling. This is a normal physiological reaction, no need to worry too much, and no special treatment. 2. hemorrhoids: the disease can lead to the patient rectum and anal area of the venous swelling, in the process of defecation is likely to lead to hemorrhoidal nuclei prolapse, and may also aggravate the swelling of the veins, which may result in the stool perineum swelling, may also be accompanied by perianal swelling, stool with blood and other symptoms. 3. Gynecological inflammation: commonly seen in vaginitis, pelvic inflammatory disease, cervicitis and other diseases, such as vaginitis, under the stimulation of inflammation, resulting in vaginal local mucosal congestion, edema, which may result in perineal swelling, may be accompanied by abnormal leukorrhea, pain in the abdomen and other symptoms. The perineal swelling may also be caused by other reasons. If the symptoms are serious, you should consult a doctor as soon as possible to clarify the causes and then give targeted treatment.