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.
Infectious causes of swollen testicles include epididymitis (inflammation of the tube that carries sperm from the testicle to the penis) caused by the sexually transmitted diseases chlamydia or gonorrhea. These STDs can cause a range of other symptoms besides swollen testicles, and are easily treated with antibiotics.