Tight and hard stomach in the 4th month of pregnancy, mostly considered as occasional contractions, fetal growth and development enlarging the uterine cavity or other phenomena, if they occur infrequently, or without other discomfort, no special treatment is needed: 1. Occasional contractions: this occasional contraction lasts for a short time and disappears soon, mostly a normal situation, no special treatment is needed. If the contractions gradually become stronger and more frequent, cervical canal length measurement is also needed. If the length becomes shorter, miscarriage may occur, and timely consultation is needed to gradually relieve such contractions through fetal preservation treatment; 2, the uterus increases: for some pregnant women who are thin, the size of the fetus in the uterine cavity has become larger in the fourth month of pregnancy, and the consequent increase in the uterus may stretch the belly, resulting in a tight and hard stomach; 3, other: pregnant women have gastrointestinal discomfort, such as constipation, or consumption of More gas-producing food, such as soy, sleep without being covered to cause the stomach cold, or indigestion caused by abdominal distension, etc., will also cause the stomach tight and hard, at this time should be timely rest, usually do a good job of diet and health care.