Walking in the middle of pregnancy with a hard and tight stomach is mainly caused by the sensitive contractions of the uterus, but may also be caused by fetal movement. If it is caused by fetal movement, just regular maternity checkups are needed and no special treatment is required. If it is caused by uterine contraction, there are many reasons. 1, overwork: overwork is an important factor that causes uterine contraction, generally due to long periods of standing or walking without proper rest, resulting in pregnant women overworked, causing uterine contraction and a hard and tight stomach. It is recommended that pregnant women take timely rest and reduce exercise; 2. Emotional changes: due to the elevated hormone levels of pregnant women during pregnancy, it is very easy to cause emotional changes, such as mental tension, excessive stress, excessive emotional changes trigger uterine contractions, resulting in a hard and tight stomach. Pregnant women need to maintain a good mood and appropriately relieve their emotions; 3. Stimulating food: the consumption of overly stimulating food causes uterine contractions, such as spicy and cold food, which causes excessive intestinal peristalsis induced uterine contractions, resulting in a hard and tight stomach. Pregnant women need to avoid these foods and maintain a good diet; 4, physiological sensitive contractions: from 13-14 weeks of pregnancy, the uterus will appear spontaneous sensitive contractions, irregular, may appear after exertion, after walking for a long time, when holding urine, when changing position, which is a normal physiological phenomenon; 5, pre-eclampsia: if the uterus contractions are frequent, accompanied by abdominal pain, or vaginal bleeding, water, consider pre-eclampsia. If the contractions are frequent, accompanied by abdominal pain, or vaginal bleeding and watering, it is considered to be a manifestation of pre-eclampsia miscarriage, and there can also be a hard and tight stomach. In this case, you should consult a doctor in time, do ultrasound to check the development of the fetus, the position of the placenta, the length of the cervix, to further clarify the diagnosis, and if necessary, give drugs to inhibit contractions for fetal preservation treatment. If a pregnant woman has a hard and tight stomach after walking, she should relax, avoid overworking, observe the frequency of the hard and tight stomach, if she feels pain for 10-15 minutes, or if she has bleeding, vaginal water, abnormal fetal movement, etc., she should seek medical treatment in time.