Lower body pain when walking in late pregnancy may be caused by a variety of factors, such as physiological factors, or vulvar swelling and pain, inflammation of the pubic area and other pathologic factors, should be timely to the hospital for examination and then targeted treatment. First, physiological factors 1, the fetal head into the pelvis: due to the fetal head down into the pelvis, pressure on the pubic symphysis and triggered the separation of the pubic symphysis, the pain in the lower body, a slight pain is a normal physiological phenomenon. It is recommended to avoid strenuous exercise, you can carry out appropriate activities, so as not to overwork the joint ligament pain; 2, hormone secretion: may be due to the hormone secretion of pregnant women, pelvic position ligament laxity, pelvic separation of the situation, resulting in pain in the lower body, generally do not need special treatment, rest; 3, the uterus increases: due to the uterus increases on the pelvic organs, ligaments formed by the oppression, caused by the tension, generally do not need special treatment. Generally no special treatment is needed. Pathological factors 1, vulvar swelling and pain: fetal enlargement oppressed to the inferior vena cava, resulting in blood return obstruction caused by vulvar swelling and pain, walking will appear to stimulate the feeling of pain. It is recommended that pregnant women take proper rest, do not walk for a long time, if the pain in the lower body is obvious, go to the hospital in time; 2, vulvar inflammation: such as vulvitis, vaginitis, etc. will cause friction in the lower body when walking, and the pain will appear. You can take the way to wash the vulva area to relieve, if not relieve, need to go to the hospital for relevant examination, under the guidance of the doctor medication. Usually pay attention to the hygiene of the pubic area, you can wear some loose cotton underwear, maintain a nutritious and healthy diet, regular maternity checkups, and if you find any abnormality, seek medical attention in time.