The small abdominal distension and frequent urination may be caused by drinking too much water, or it may be caused by urethral stenosis, chronic prostatitis and other diseases. 1. Drinking too much water: when the body drinks too much water, the urine in the bladder will increase, so there will be a small abdominal distension, frequent urination symptoms, is a normal physiological phenomenon, do not have to worry too much. 2. Urethral stenosis: the occurrence of this disease is related to trauma, medical injury, gonorrhea, congenital and other factors, because the patient will have poor urination, urinary retention symptoms, so the patient will have small abdominal distension and frequent urination. There are also symptoms such as urinary urgency, dysuria, and enuresis. 3. Chronic prostatitis: the etiology of the disease is more complex, may be related to Chlamydia trachomatis, mycoplasma, fungi, viruses and other pathogenic microorganisms. The patient will appear urinary frequency, urinary urgency, urinary symptoms, perineum, suprapubic region will also appear swelling pain, can be manifested as abdominal distension urinary frequency. 4. Urinary tract infection: this disease is caused by bacteria, adenovirus, chlamydia and other pathogenic microorganisms, common predisposing factors organism immunity decline, abnormal development of urinary tract structure, urinary tract obstruction. Some patients will have symptoms such as frequent urination, painful urination and abdominal distension. Causes of abdominal distension and frequent urination are more reasons, need to go to the hospital in a timely manner, to clarify the specific causes after treatment.