What should I do if my left testicle hurts when touched?

Pain in the left testicle upon touch may be caused by conditions such as orchitis or epididymitis. Patients should pay attention to whether the left scrotum is swollen or if the skin on the left side appears red. If a patient experiences one-sided scrotal pain with significant tenderness, it is recommended to immediately go to the hospital for a scrotal ultrasound examination. Ultrasound imaging can clearly show swelling of the epididymis and changes in blood flow signals.