The possible reasons for feeling the urge to urinate, but not much urination are as follows: 1. The presence of urinary tract infection can lead to bladder mucosal congestion and edema with increased sensitivity, and storing a small amount of urine can produce an obvious sense of urinary irritation, and the amount of urination will be small, waiting for the infection to be completely controlled, the mucosal edema disappears, and the sensitivity decreases, at which time the amount of stored urine increases and the amount of urination increases. 2, The presence of irritating lesions in the bladder urethra, such as the presence of rupture of the mucosa, the presence of stones in the urinary tract, the presence of tumors, polyps, etc. can lead to increased local irritation, which can produce an obvious sensation of urination, but because the bladder does not store much urine, the volume of urination is not much each time, and a urinary ultrasound examination or cystoscopy is needed to rule out the presence of relevant irritating lesions. 3. Overactive bladder The cause of overactive bladder is unknown, but it is mainly caused by excessive and frequent contraction of the bladder muscles, without any painful urination, back pain and fever, etc. Routine urine examination is normal, and a urodynamic examination is usually required to confirm the diagnosis of overactive bladder.