Varicoceles usually occur during puberty. The spermatic cord that holds up each testicle contains the veins, arteries, and nerves. The cords support these glands. The function of the valves inside the veins in the cord is to move the blood from the testicles to the scrotum, and sending it back to the heart. Varicoceles often form on the left side, because of the position of the left testicular vein which is connected to the heart. More pressure is required on the left side to keep the blood flowing through the veins. The problem of varicocele occurs if these valves prevent the blood from flowing properly. It develops slowly over time when the blood begins to pool in the vein, causing the veins to enlarge and sudden swelling of the scrotal veins. This might damage the testicle and result in worsened fertility.
Doctors are still not certain what actually causes varicoceles and the exact cause is unclear.

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