How does mild varicocele affect male infertility?

Is Grade 1 Varicocele a Serious Problem?

Varicocele occurs when the one-way valves in the veins do not function properly and cause blood to flow backward into the testicle due to the dilation of testicular veins and scrotal cord. The blood entering the testicles contains respiratory waste products. Therefore, varicocele can cause increased waste products in the testicle, increased testicular temperature, and sperm disorders in men.