Urinary tract pain after sit-ups is usually due to prostatitis, cystitis, urethral stones and other diseases. 1. Prostatitis: prostatitis generally causes pelvic floor nerve excitation, sit-ups will stimulate the urethra, resulting in urethral pain, urinary urgency and other symptoms, resulting in urinary tract pain after sit-ups. 2. Cystitis: Cystitis is an inflammation of the bladder area, which can cause pain in the urinary tract, discomfort in urination, etc. After sitting up, the patient will squeeze and stimulate the bladder, resulting in pain in the urinary tract after sitting up. 3. Urethral stones: urethral stones are stones that occur in the urethra, which can cause pain in urination, pus and urine, etc. The position of the stones will change after the patient sits up, which will stimulate the urethra and lead to urinary tract pain after sitting up. In addition, other diseases may also cause pain in the urinary tract after sitting up, it is recommended that patients go to the hospital for timely examination after the appearance of the above symptoms, and always pay attention to body care.