A hard and tight stomach at 24 weeks of pregnancy is a sign of contractions, and if it is accompanied by vaginal bleeding, it may be a preterm miscarriage. 24 weeks pregnant belongs to the mid-pregnancy stomach tight and hard is a contraction, if the uterine contractions are not regular, and will not be aggravated, through sufficient rest after the phenomenon of abnormal contractions will occur to ease. When a pregnant woman has a hard and tight stomach at 24 weeks of pregnancy that continues to be unrelieved or is accompanied by back pain, abdominal pain, vaginal bleeding and other abnormalities, it may be a miscarriage with precursor, you need to go to the hospital as soon as possible to seek medical attention, and under the guidance of the doctor to carry out positive interventions to ensure that the fetus and the health of the mother during the pregnancy.