One month after varicocele surgery, the left testicle is still painful, which is mainly considered to be related to postoperative infection, recurrent condition, external injury and other diseases. 1. Post-operative infection: after the surgery, the care is not in place, resulting in infection in the affected area, which may cause testicular pain. 2. Recurrence: after surgery, most patients can achieve the curative effect, but clinically, some patients may experience recurrence, which may lead to the symptoms of left testicular pain. 3. External injury: the left testicle is hit by external force, or the underwear is too tight to the affected area to form pressure, can lead to the left testicle pain symptoms. 4. Other diseases: such as epididymitis, orchitis and other diseases, can also lead to pain and other uncomfortable symptoms in the left testicle. Postoperative symptoms may also be related to other causes. Patients should pay attention to it, consult the doctor in time to confirm the diagnosis, and be treated accordingly.