The possible causes of back pain with testicular pain are: 1. Acute orchitis or epididymitis, when the inflammation is not effectively treated, can involve the spermatic cord, causing pain radiating from the groin area and can radiate to the posterior lumbar pain. At this time, patients can find that the testicles or epididymis are obviously swollen and painful to touch, and the testicles and epididymis produce pendulum-like oscillations after activity, while involving the spermatic cord and pain in the posterior lumbar region, requiring anti-infection treatment.2. Stones in the lower part of the ureter can cause lumbago, accompanied by radiating pain in the scrotum and testicles, accompanied by painful urinary frequency and urgency, and female patients may even have pain in the pubic mound region. Urological ultrasound is needed to rule out the presence of stones in the lower ureter, especially stones at the end of the ureter, all of which can cause radiating pain in the testicular area.3. Varicocele can also involve the testicles and lumbar pain, and the accumulation of varicose veins in the scrotum can cause painful testicular swelling. Varicocele can also involve the groin area and the posterior lumbar region with swelling and pain, especially after activity or exertion.