A hardening of the stomach occurs when you are more than 37 weeks pregnant. If there is no pain, we should consider that there are false contractions, a physiological manifestation. Because in the process of the growth of the fetus, the uterus will also increase in size, during this period of time the sensitivity of the uterus increased, in a slight external stimuli or the fetus in the uterine cavity activities slightly larger amplitude, will trigger the symptoms of uterine contractions, this situation does not require treatment, relaxation, pay attention to rest, can be relieved by themselves. But if there is pain in the process of hardening of the stomach, it is considered to be a manifestation of preterm delivery of the fetus, this situation should be timely to go to the hospital for examination, to determine the signs of preterm delivery, it is best to keep the fetus up to 38 weeks before the baby is born.