The tightness of the pregnant woman’s stomach may be caused by pseudocontractions, which are physiological manifestations, or may be caused by premature labor, miscarriage and other pathological causes. During pregnancy, the growth and development of the fetus in the uterus may stimulate the uterine muscles, resulting in uterine spasms, which leads to the symptoms of tightness and hardness of the stomach, or uterine contractions caused by stimulation from the external environment, all of which belong to the physiological symptoms, and are mainly characterized by the irregularity of the onset of the attack, the irregularity of the interval, no obvious pain, and can be relieved by themselves. However, if the stomach tightens, accompanied by obvious discomfort such as abdominal pain, vaginal bleeding, it may be due to the occurrence of preterm labor, miscarriage, at this time should be timely medical care, relevant examinations, a clear diagnosis, timely treatment. If there is any abnormality during pregnancy, you should consult a doctor promptly.