The tightness and hardness of the stomach in the 28th week of pregnancy may be caused by false contractions or pre-miscarriage. 1. False contractions: 28 weeks pregnant and gradually to the late pregnancy, once in a while, the stomach tightness and hardness, but the duration of a short period of time or the intensity of the weak, after resting will gradually ease, then it may be false contractions, is a normal physiological phenomenon, do not need special treatment. 2. Pre-eclampsia: If the stomach is tight and hard a lot of times, the interval is very long, and accompanied by vaginal bleeding and fluid, then consider premature rupture of membranes, pre-eclampsia and other conditions. There may be other reasons for the tightness and hardness of the stomach at 28 weeks’ gestation, so if there are obvious abnormalities before the full term, then it is recommended to consult a doctor in a timely manner.