Urinary tract infection cannot hold urine because the infection causes congestion and edema in the mucosa of the bladder and urinary tract, which increases the sensitivity of the mucosa, so that when a small amount of urine is stored, a strong feeling of urination can occur. Patients feel that they cannot hold urine and need to urinate immediately, but there is not much urine stored in the bladder, so the amount of urine is not much. After anti-infection treatment, the mucosal edema subsides and the sensitivity returns to normal, and the bladder capacity returns to normal at this time, more urine can be stored and the patient will not feel unable to hold urine. Therefore, it is a specific manifestation of the infection that often results in a decrease in effective bladder capacity due to the increased sensitivity caused by the infection, and therefore the inability to hold urine can occur. After effective anti-infection treatment, the infection is cured and the condition can be improved naturally, but a urinary ultrasound examination is still needed to rule out other causes of combined infection, such as the presence of stones combined with infection, both of which can cause the patient to be unable to hold urine, and extracorporeal shock wave lithotripsy is needed after simple anti-infection treatment to completely control the symptoms.