The feeling of anal swelling in late pregnancy may be caused by constipation, hemorrhoids, an enlarged uterus and a descending fetal head, etc. It is a common symptom in late pregnancy and generally does not require special treatment. If it is accompanied by contractions, vaginal bleeding and other symptoms, it may be a sign of labor, so you should go to the hospital in time for delivery. The anal swelling in late pregnancy is mainly due to the following situations: 1. constipation: pregnant women have less activity in late pregnancy, poor gastrointestinal motility, some women can become constipated in late pregnancy, resulting in poor defecation, feces blocking the anus causes local swelling discomfort. In late pregnancy, attention should be paid to increasing the intake of coarse fiber food, which is conducive to promoting defecation, and if necessary, you can follow medical advice to choose the drug treatment or enema that can be used during pregnancy for treatment; 2, hemorrhoids: pregnant women in late pregnancy constipation, causing rectal venous reflux obstruction, the formation or aggravation of hemorrhoids, hemorrhoid venous plexus tortuous swelling, resulting in anal swelling, the formation of thrombosed hemorrhoids, but also cause severe pain in the anus. Pregnant women in daily life, pay attention to avoid standing for a long time, or squatting for a long time, so as not to compress the rectum and aggravate the symptoms; 3, the uterus increases: late pregnancy fetal growth, the uterus increases, compressing the pelvic organs and rectum, which can lead to anal swelling; 4, the fetal head decline: late pregnancy fetal pelvic, the fetal head decline, the uterus compressing the rectum, causing anal swelling. Pregnant women can maintain a left-sided position when resting to relieve the discomfort.