Hidden pain in the stomach from time to time in the third trimester of pregnancy may be due to the following reasons: 1, the third trimester of pregnancy from the early pregnancy into the middle pregnancy, the uterus is also gradually enlarged, from the pelvis into the abdominal cavity. In the enlarged uterus will pull the pelvic ligaments, resulting in the symptoms of hidden pain in the stomach. It is normal physiological changes generally does not matter, it is recommended to pay attention to rest, do not lift heavy objects or do strenuous sports, as well as heavy physical labor; 2, if the stomach pain accompanied by the symptoms of tightness of the belly, considered to be the emergence of contractions, this period of time contractions are generally false contractions. The fetus is prone to transient hypoxia during contractions, and frequent false contractions may affect the normal development period of the fetus, or may be transformed into true contractions. Therefore, it is best to go to the hospital for examination and take medication such as albuterol to relieve the symptoms under the doctor’s guidance if necessary.