The symptoms of pins and needles in the abdomen of pregnant women in the third trimester may be caused by the following factors: first, if the pregnant woman has pins and needles in the belly, it is possible that the symptoms are caused by the gradual increase of the abdomen, resulting in the rupture of the abdominal skin muscle fibers; second, the symptoms may be caused by the enlarged uterus involving the surrounding ligaments, which is a normal symptom reaction during pregnancy; third, if the pregnant woman not only has pins and needles in the abdomen, but also has irregular vaginal bleeding, it may be caused by pre-eclampsia. If a pregnant woman has pins and needles in the small abdomen, accompanied by irregular vaginal bleeding, it may be caused by pre-eclampsia, the patient should go to the hospital for ultrasound examination in time to confirm the diagnosis according to the examination results.