Burning pain on contact 20 days after hernia surgery may be caused by poor wound healing, overstimulation, bacterial infection and other factors. 1. Poor wound healing: 20 days after hernia surgery, the wound area is slow to recover, poor healing, there will be burning pain on contact, only mild pain, may gradually disappear. 2. Excessive stimulation: after hernia surgery, the wound is not fully healed before some strenuous exercise, or the wound area is compressed, it will make the wound contact burning pain. 3. Bacterial infection: after hernia surgery, the surgical incision site may be infected, due to inflammatory substances stimulation, it will cause burning pain in the wound, accompanied by oozing, swelling, redness and other symptoms. 20 days after the hernia surgery, the wound contact burning pain, and there are other abnormal manifestations, it is recommended to consult a doctor for examination as well as treatment, to avoid affecting the recovery.