The lower body pain when walking in late pregnancy may be caused by a variety of factors, such as physiological factors, or pathological factors such as vulvar swelling and pain, inflammation of the pubic area, should be promptly checked at the hospital before targeting treatment. A, physiological factors 1, the fetal head into the pelvis caused by: due to the fetal head down into the pelvis, pressure on the pubic symphysis and triggered by the pubic symphysis separation, lower body pain, mild pain is a normal physiological phenomenon. It is recommended to avoid strenuous exercise and to carry out appropriate activities so as not to cause joint ligament pain by overexertion; 2, hormone secretion caused by: may be due to hormone secretion of pregnant women, pelvic position ligament relaxation, pelvic separation, resulting in lower body pain, generally do not need special treatment, more rest; 3, uterine enlargement caused by: due to uterine enlargement on the pelvic organs, ligament formation pressure, pulling caused by, generally do not need special treatment. Generally no special treatment is needed. Pathological factors 1, vulvar swelling and pain: the enlarged fetus presses on the inferior vena cava, resulting in obstruction of blood return and causing vulvar swelling and pain when walking. It is recommended that pregnant women take proper rest and do not walk for a long time. If the pain in the lower body is obvious, go to the hospital in time; 2. Inflammatory diseases in the pubic area: such as vulvodynia and vaginitis can cause friction and pain in the lower body when walking. You can take the way to wash the vulva area to relieve, if not relieved, you need to go to the hospital for relevant examination and use medicine under the guidance of the doctor. Normally, you should pay attention to the hygiene of your pubic area, you can wear some loose cotton underwear, keep your diet nutritious and healthy, have regular maternity checkups, and if you find any abnormalities, seek medical attention in time.