Hardness of the stomach in the 5th month of pregnancy may be physiological uterine contractions, but if they last longer and are accompanied by obvious abdominal pain, they may also be pathologic uterine contractions. Physiological uterine contractions usually appear in the 12th to 14th week of pregnancy, mainly a feeling of tightness in the lower abdomen, but the duration is shorter and there is no obvious pattern, not accompanied by abdominal pain, vaginal bleeding, cervical changes, generally do not need to be overly nervous. However, if it lasts for a longer period of time and is accompanied by vaginal bleeding, it may be a pathologic contraction, suggesting the possibility of miscarriage or preterm labor, and it is usually necessary to consult a doctor in time for a clear diagnosis and treatment to prevent miscarriage or preterm labor from occurring. In the fifth month of pregnancy, pregnant women have a hard stomach, usually do not need to be nervous, usually pay attention to rest, avoid overwork, if there is abnormal abdominal pain, you should consult a doctor in a timely manner.