Your body needs some sodium to function properly because it: 1  Helps maintain the right balance of fluids in your body. 2  Helps transmit nerve impulses. 3  Influences the contraction and relaxation of muscles.
Some of the conditions that can cause a testicle lump, swelling, and/or pain include: 1  Torsion of the testicle. 2  Injury. 3  Infection. Hydrocele. 4  Varicocele. Epididymal cyst/spermatocele.  Inguinal 1  hernia. Kidney  stones.
Perhaps, one of the most common causes of testicular pain related to infection is caused by infection of a portion of the testicle called the epididymis. This is a small tubular structure that sits on top of the testicle and aids in the maturation of sperm. Infection of the epididymis can sometimes cause swelling and fevers, but almost always causes a degree of pain.