If you are 30 weeks pregnant and your stomach is hard and tight, lying down is fine, and if there is no vaginal discharge or bleeding, you may not be hospitalized for a while, but if there is vaginal discharge or bleeding or if your stomach is tight and hard, you need to be hospitalized. Standing for a long time, prolonged exertion, mental stress, anxiety, pregnant women keep the same position for a long time, etc. can trigger the appearance of pseudocontractions, resulting in stomach tightness and hardness, after resting or changing the position of pseudocontractions disappeared. False contractions can appear in early pregnancy, is a physiological phenomenon of pregnancy, generally do not need special treatment, can not be hospitalized, dynamic observation. 30 weeks pregnant women appear regular stomach tightness and hardness, lying down abdominal pain relief, but accompanied by vaginal water, bleeding, may be the first sign of preterm labor, rupture of fetal membranes, need to be hospitalized. When the stomach is hard and tight at 30 weeks of pregnancy and the amount of vaginal bleeding is greater than the usual amount of menstruation, consider placenta praevia, which also needs to be hospitalized. If you are 30 weeks pregnant and have a hard and firm stomach, consult a doctor in time to find out the cause and decide whether to hospitalize under the guidance of a professional doctor.