In the middle of pregnancy, the belly began to occasionally hard situation, some pregnant mothers are particularly worried and afraid, this is not the legendary baby lack of oxygen, right? This is actually a normal physiological phenomenon of pregnant women. What conditions are likely to cause the belly tight and hard? 1, the body is cold, kicking the blanket at night, blowing too much air conditioning, will cause the belly hard. 2, working mothers work stressful, nervous not relaxed will also cause the belly hard. So after the pregnancy of the mother better not to do too much pressure intensity of the work, timely transfer positions, change some easy work. 3, constipation, constipation will also cause the belly tight, because the need to force, 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 it? When the belly is hard, do not be too nervous, it is best to sit down to rest or lie down to rest. Working mothers, if the belly is tight and hard because of work, 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 the like). If your belly is hard with pain, you should pay attention. Some constipated mothers also have tummy aches when they squat for too long. This is the time to stop immediately, stand up slowly and return to your 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.