Press the lower abdomen and urinate. What's going on?

When pressing the lower abdomen, there is a desire to urinate. Possible reasons are: 1. There is a certain amount of urine stored in the bladder, but the urine volume is not much at this time, and it does not reach the initial feeling capacity. When pressing the lower abdomen with your hand, the abdominal pressure increases, and it is further transmitted to the bladder, causing the pressure in the bladder to increase, reaching the pressure of the initial feeling of urinating. At this time, you can feel the desire to urinate. Often seen in the bladder when the urine volume is about 100ml, pressing the lower abdomen with your hand, you can show the feeling of urinating. 2. The patient's bladder dysfunction leads to incomplete emptying, such as a certain amount of urine stored in the bladder, but due to detrusor contraction weakness, part of the urine is discharged, and part of the urine remains in the body, resulting in excessive residual urine. At this time, press the lower abdomen with your hand, and there is still urine that is not discharged completely. It is recommended to further perform residual urine B ultrasound examination to rule out whether there is such a situation. 3. Urinary retention caused by various urethral obstruction factors, such as prostatic hyperplasia, urethral stricture, etc., often increases due to urethral resistance, and part of urine cannot be discharged from the bladder, but remains in the body. The patient presses the small abdomen with his hand, can touch the small abdomen swelling, can feel the urine, consider the existence of chronic urinary retention, suggest further B ultrasound examination to confirm the diagnosis.