Pregnancy belly pain that can’t be held in the toilet may be caused by the enlarged bladder stimulating the uterus to contract and the constant contraction of the bladder’s forced urethral muscle. Pregnancy can not hold the toilet belly pain, may be the enlarged bladder stimulation of the uterus caused by the contraction of the pain produced by the contraction, after urination, this stimulation is reduced, the symptoms of stomach pain will gradually disappear. After pregnancy, the toilet can not hold the stomach pain, may be after urination bladder urethritis muscle contraction, the human bladder itself repair will produce the symptoms of stomach pain, the pain is more pronounced can be appropriate to massage the bladder position to relieve. After pregnancy, the uterus gradually increase pressure on the bladder will have more frequent urination, urination should be promptly discharged, do not hold too long.