The tightness and hardness of the stomach in the eighth month of pregnancy may be caused by false contractions and the onset of labor. 1. False contractions: eight months pregnant stomach tight and hard may be false contractions caused by eight months pregnant has entered the late stage of pregnancy, the uterus from a relatively stable state gradually to the state of activity, there will be false contractions, the clinical manifestation of the lower abdomen hard and taut, not accompanied by pain in the lower abdomen and vaginal bleeding, belong to the physiological contractions, do not need special treatment. 2. Pre-eclampsia: If the stomach is tight and hard in the eighth month of pregnancy, and if it is accompanied by abdominal pain and light pink discharge, and if there are regular contractions, each of which lasts for about thirty seconds, then it may be pre-eclampsia. If you are pregnant and have other symptoms, you should go to the hospital in time to avoid delaying your condition and causing adverse consequences.