The 36th week of pregnancy belongs to the late pregnancy period, when the uterus becomes bigger and the uterus has a squeezing effect on the surrounding organs and intestines. The enlarged uterus can also touch the upper side of the pubic symphysis, which makes the bottom of the lower abdomen to have some pain. When the uterus is enlarged, the ligaments around the uterus are stretched and tightened, which can also cause pain. When the uterus becomes bigger and there is frequent fetal movement, there is a certain degree of contraction, and this pseudo-contraction can also lead to pain and discomfort at the base of the abdomen, which is normal physiological pain and does not require special treatment. However, if the pain at the bottom of the small abdomen is severe and cannot be relieved for a long time, consider the possibility of preterm labor or pre-eclampsia, and go to the hospital for diagnosis and treatment in time. When the pain in the small abdomen may also be gynecological diseases, gynecological inflammation or intestinal diseases, which can also cause this situation, pregnant women should go to the hospital in time for careful examination, diagnosis and symptomatic treatment.