If you hold urine and have pain in your small abdomen, then the possible causes are: 1. The amount of holding urine is too large. For example, if you hold urine for more than 4 hours, or if you hold urine for more than 300mL, it will cause a sharp increase in bladder tension, and then there can be small abdominal pain. If you hold urine too much under physiological conditions, which causes pain in the small abdomen, it can be relieved immediately after urination. The actual pain is often caused by some disease, such as male prostate hyperplasia, or urethral stones, urethral tumors, resulting in increased resistance to urination, the more urine the patient holds in the bladder, so there will be small abdominal pain. 2, there is inflammation of the bladder. This can cause there to be local erosion of the mucosa, or a local inflammatory reaction, and then in the state of holding urine, the local mucosal tension rises, which can cause symptoms of local pain. In this case, urination can also be accompanied by urinary urgency, painful urination, or a feeling of incomplete urination, accompanied by an increase in body temperature.