If there is hardness and tightness in the abdomen at 30 weeks of pregnancy, if it is not accompanied by abdominal pain, redness or other uncomfortable symptoms, and the episodes are mainly at night, then it is usually a normal physiological manifestation. Due to the enlargement of the uterus and its higher sensitivity, it is easy to cause contractions after stimulation, which manifests as hardness and tightness in the abdomen. This situation does not require special treatment and does not need too much tension. If the stomach is hard and tight with abdominal pain, vaginal bleeding and regular contractions, it may be caused by preterm labor, usually caused by placental abnormalities or reproductive tract infection. You should go to the hospital for examination and treatment of fetal preservation. You can use medication to inhibit the contraction of uterine smooth muscle and relieve abdominal pain as prescribed by the doctor to achieve the effect of fetal preservation. Glucocorticoids should also be used to promote fetal lung maturation to reduce the risk of fetal respiratory distress syndrome. If the opening of the uterus is already 3-5 cm wide and fetal preservation is not easy, the pregnancy should be terminated in time according to the situation. Therefore, it is necessary to pay attention to rest and avoid overexertion and strenuous exercise during late pregnancy to avoid inducing contractions that may affect the growth and development of the fetus. Pay attention to strengthening nutrition, while maintaining a relaxed state of mind and avoiding emotional stimulation. Develop good hygiene habits and pay attention to keeping the vulva clean and dry to prevent infection.