Pregnancy for women is a both happy and hard thing, because during pregnancy an expectant mother needs to make sacrifices is very big, especially in the middle of pregnancy, began to have the belly occasionally hard, some pregnant mothers heart especially worried about fear, it will not be the legendary baby lack of oxygen, right? This is actually a normal physiological phenomenon of pregnant women, the normal contraction of the uterus, will not hurt, and lasts a short time. What causes belly tight and hard? 1, the body is cold, kicking the quilt at night, blowing the air conditioning is too cold, will cause the belly hard. 2, there are working mothers work pressure, mental tension does not relax will also cause belly hard. So after pregnancy, it is best not to do too much pressure intensity of the work of the mother, in time to switch positions, change some easy point of work. 3, constipation, constipation can also cause belly tight, because the need to exert, so that the pressure in the abdominal cavity increased, the baby in the stomach will be very uncomfortable, so constipation stools do not come out, we have to hurry to rest for a while, do not stay in the toilet for a long time. 4, too much activity or Action is too intense. Some mothers sit for a long time on the sudden stand up, this is not good, will also cause the belly tight. It is best to stand up slowly, a little activity and then walk normally better. Especially in late pregnancy, the amount of exercise should be appropriately reduced to walk and moderate activities, do not walk too far for too long, do not climb the stairs too much, which will cause the belly tight and hard, or worse, will cause premature labor. How to relieve the belly tight and hard? 1, when the belly is hard, do not be too nervous, it is best to sit down to rest or lie down to rest. 2, working mothers, if it is because of the work of the belly caused by the tight and hard, stop the work at hand, go outdoors for a walk, promote blood circulation, breathe the fresh air, listen to some of the more soothing music (Walkman and so on). 3, if the belly is hard, accompanied by pain, the belly is hard. The case is also accompanied by pain, it should be noted. Some constipated mothers in the squatting toilet for too long will also be accompanied by stomach pain. This time to stop immediately, slowly stand up, return to the position or bed rest. If it is not constipation, but similar to menstrual pain, and bleeding should be timely medical attention. Early pregnancy should also be ruled out in the case of preeclampsia, all should be careful attention. Hard belly or contraction pains? Many moms may still not be able to tell the difference between the two. In fact, it is very simple, contraction pain is regular, if each contraction lasts 1 minute, the interval of 5 minutes or less, then it is going into labor. The hard belly is not painful, this point should be noted, the duration of less than 1 minute, the belly will be hard when you sleep at night.