Hello there..... testicles are very sensitive, and even a minor injury can cause testicle pain or discomfort.... Testicle pain is an uncomfortable symptom that men can experience that has a variety of causes. Pain in one or both testicles can be caused by an infection,  an injury, testicular torsion, hernia, or a testicular swelling..... And sometimes other causes such as kidney stones also can cause testicle pain ... Consult urologist....