The hardness of the stomach in the 5th month of pregnancy is caused by contractions, and the treatment method should be chosen according to the intensity and frequency of the contractions. If the contractions are very mild and short-lived, occurring only once in a day or a few days, there is no need to worry about this situation, which is due to the development of the fetus and the gradual enlargement of the uterus stimulating the uterus to appear pseudo contractions. However, if the contractions are very frequent, occurring once in half an hour or even in ten minutes, you should see your doctor promptly. To do ultrasound to observe the length and shape of the cervical canal, to timely fetal preservation treatment, while pregnant women should pay attention to rest, fasting sex, eat light, easy to digest food, meat and vegetables, balanced nutrition, more attention to regular maternity checkups, timely detection of abnormalities in order to timely treatment, so as not to cause adverse pregnancy outcomes.