In the fourth month of pregnancy, the phenomenon of a hard stomach, if only occasionally this symptom occurs, do not need to be too nervous, because at this time will appear to have fetal movement, will easily lead to a hard stomach. If there is no pain, it is fine, pay attention to relaxation and rest. If there is hardness in the stomach and pain, it means that there is a possibility of pre-eclampsia, so you should go to the hospital for an ultrasound in time. During this period, you also need to pay attention to bed rest, do not exercise strenuously, to avoid excessive exercise, resulting in uterine contractions, which will easily lead to inevitable miscarriage. During this period, you also need to pay attention to relaxation, do not be too nervous, if too nervous, will also be easy to lead to an increase in the chances of miscarriage.