Tight and hard belly at 24 weeks of pregnancy may be caused by physiological contractions or pathological contractions: 1, physiological contractions: physiological contractions are generally caused by fetal stimulation of the uterine wall, manifested as painless irregular contractions, the number of occurrences is less, pregnant women feel tight and hard abdomen, pain is not particularly strong, there is no vaginal bleeding, is a kind of ineffective contractions, and will not cause premature labor or miscarriage, generally do not 2, pathological contractions: refers to frequent contractions, the pregnant woman can feel increased abdominal pain, tightness and hardness of the stomach, may lead to preterm miscarriage or preterm delivery, should promptly consult the doctor to choose birth control or surgical treatment. Special reminder to pay attention to more rest, do not eat cold, spicy, stimulating food, ensure dietary hygiene, relaxed mood, do not be too nervous, anxiety, regular maternity checkup.