The hardness of the stomach in the twenty-eighth week of pregnancy is considered to be caused by contractions and has nothing to do with whether or not there is hypoxia. A. Twenty-eight weeks of pregnancy has reached the late pregnancy, in the late pregnancy uterine contraction receptors gradually increased, the uterine body becomes sensitive to external stimuli, easy to produce false contractions, pregnant women are advised to wear loose clothing to reduce the stimulation of the uterus. Pregnant women also should not frequently touch the uterus, touching the uterus will also stimulate the uterus to produce contractions. Second, if the belly is hard, accompanied by abdominal pain that can be felt, abdominal pain with regularity, with increasingly long duration and short intervals, it is recommended to go to the doctor in time to check the length and shape of the cervical canal and, if necessary, to keep the fetus in treatment to avoid causing preterm labor. During pregnancy, we should pay attention to regular maternity checkups and deal with abnormalities in time to avoid causing bad pregnancy outcomes.