Walking stomach tightness in the second trimester of pregnancy may be caused by excessive fatigue of pregnant women, irritating food, preterm miscarriage, etc. It can be relieved by sufficient rest, adjusting diet and preserving the fetus. 1. Overwork: If a pregnant woman stands or walks for a long time during pregnancy, it may cause uterine contractions, which may lead to tightness in the stomach when walking in the second trimester. At this time, pregnant women should maintain sufficient rest and reduce exercise, the symptoms can usually be relieved. 2. Irritating food: If a pregnant woman consumes irritating food, it may cause uterine contractions due to fast intestinal peristalsis, resulting in tightness in the stomach in the second trimester of pregnancy. Pregnant women should adjust their diet and maintain good eating habits. 3. Pre-eclampsia: If a pregnant woman is accompanied by abdominal pain, vaginal bleeding and other symptoms, pre-eclampsia may have occurred. At this time should be timely consultation, if necessary, given to inhibit contractions of drugs to protect the fetus treatment. If a pregnant woman walks in the second trimester with a tight stomach, accompanied by the above symptoms, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor, improve the relevant examination, to clarify the cause of the disease, symptomatic treatment.