Pregnancy is both a happy and hard thing for women, because during pregnancy a pregnant mother needs to do a lot of sacrifices, especially in the middle of pregnancy, began to have a belly occasionally hard situation, some pregnant mothers are particularly worried and afraid, this 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 last for a very short time. What causes the belly to tighten and hard? 1, the body is cold, kicking the blanket at night, blowing too much air conditioning, will cause the belly hard. 2, there are working mothers work pressure, mental tension does not relax will also cause the belly hard oh. So after the pregnancy of the mother better not to do too much pressure work, timely transfer positions, change some easy work. 3, constipation, constipation will also cause the belly tight, because the need to exert, so that the pressure in the abdominal cavity increased, the baby in the belly will be very uncomfortable, so constipation on not out, we must hurry to go 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 to suddenly stand up, this is not good, will also cause the belly tight. Especially in the second trimester, the amount of exercise should be properly reduced to walk and ease, do not walk too far for too long, and do not climb the stairs too much, which will cause the belly to tighten and hard, or worse, will cause premature birth. How to relieve the belly is 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 the work relationship caused by the belly tight and hard, first stop the work at hand, go for a walk outdoors to promote blood circulation, breathe fresh air, listen to some more soothing music (Walkman and so on). 3, if the case of hard belly is accompanied by pain, it should be noted. Some constipated mothers in the squatting toilet for too long will also be accompanied by stomach pain. At this time, you have to stop immediately, slowly stand up and return to the position or bed to rest. If the pain is not constipation but is similar to menstrual pain and bleeding, you should seek medical attention. In early pregnancy, it is also important to rule out pre-miscarriage, so be careful. Hard belly or contraction pains? Many mothers may still not be able to tell the difference between the two. If each contraction lasts for 1 minute with an interval of 5 minutes or less, then it is time to deliver. And belly hardness is not painful, this point should be noted, the duration of less than 1 minute, the night sleep will also belly hardness.