Six months pregnant stomach hard and tight may be a normal phenomenon of false contractions, but also may be a precursor to miscarriage. 1. False contractions: with the increase in pregnancy time, the fetus continues to grow, the amplitude of fetal movement is increasing, when the fetus fetal movement may cause false contractions, this situation does not require special treatment to rest naturally after improvement. 2. precursor to miscarriage: if the stomach is hard and tight, regular and accompanied by pain, abdominal drop, or vaginal bleeding phenomenon, you need to go to the hospital in a timely manner to do ultrasound, fetal heart monitoring, if the fetus has vital signs, the need for timely fertility preservation treatment. For six weeks pregnant stomach hard tight phenomenon there are other reasons, need to go to the hospital in time for a clear diagnosis, once found that the fetus intrauterine hypoxia need to be timely treatment of oxygen, to avoid intrauterine asphyxiation of the fetus.