Can not hold urine, then the possible reasons: first, the urinary tract infection, this time the mucosal epithelium of the urinary tract congestion and edema, accompanied by a high degree of sensitivity. Such a small amount of urine can produce a strong sense of irritation, the bladder can not be inhibited contraction, and then appear urination action. The patient needs to go to urinate immediately and not hold the urine, which is caused by the infection. It can also be accompanied by frequent urination, urgency, back pain, fever and other symptoms. Routine urine examination and urine culture test are needed to confirm the diagnosis. Secondly, the presence of irritating factors in the bladder, such as the presence of stones, the presence of tumors or the presence of local mucosal rupture damage, can lead to the inability to hold urine. Because this urine becomes a pathogenic factor, contact with the submucosa, or the bladder appears to be frequently contracted, so the patient can not hold urine. Thirdly, if there is a tumor in the bladder, the tumor volume increases and occupies part of the space of the bladder, which will make the effective capacity of the bladder decrease. With the further increase of tumor volume, the capacity of the bladder will be further reduced, and the patient will gradually have the symptom of not being able to hold urine.