Hello, * As per my surgical experience, the painful urination after hernia surgery may be indicative of - post-spinal anesthesia sequence - if history of catheter insertion during or after surgery, a urethral narrowing or stricture - cystitis without urinary infection - prostate edema or inflammation - concern with certain antibiotics or anti-inflammatory medications if currently being consumed. A complete and thorough physical examination, ultrasound of the abdomen and pelvis, prostate with post void residual urine volume will be of immense help to conclude the cause and care accordingly. Hope I have answered your query. Let me know if I can assist you further. Take care Regards, Dr. Bhagyesh V. Patel, General Surgeon