The 5 month pregnant stomach tight and hard may be false uterine contractions, preeclampsia and other reasons, through rest, birth control treatment to relieve. 1. False uterine contractions: 5 months pregnant stomach tight and hard, may be caused by false contractions, mainly with the increase in gestational weeks of the fetus is growing, the uterus smooth muscle paroxysmal spasm caused. Pregnant women will have a feeling of tightness in the lower abdomen, short duration, no regularity, after rest can disappear on their own, choose to sleep on the left side of the lying position, to provide the placenta with more adequate blood oxygen, you can also support the sagging abdomen to alleviate the symptoms. Pregnant women who do not experience vaginal bleeding, shortening of the cervical canal, or dilation of the cervical opening will not enter labor. 2. Pre-eclampsia: 5 months pregnant stomach tight and hard may be caused by pre-eclampsia, at this time to go to the hospital to do ultrasound to understand the development of the fetus in the womb, necessary to use magnesium sulfate to inhibit uterine contractions, pay attention to bed rest. The reason why the stomach is tight and hard in the fifth month of pregnancy is more, serious cases are recommended to seek timely medical treatment, the above medication is used in accordance with the doctor’s instructions.