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Hello and thank you for your question. I'm sorry that your sone isn't feeling well.
Testicular pain can be a sign of a serious problem. If your son't pain is severe, his scrotum is swollen, and he is having pain with walking, he should be seen by a doctor immediately. He could have a testicular torsion (twisted testicle). In this situation, the blood supply to the testicle is cut off and immediate medical attention is required to preserve the testicle.
If his pain does not seem to be so severe, he should still be evaluated. Less serous causes of testicular pain are epididymitis or torsion of the appendix testes. These are glands that lie on top of the testicle that can become inflamed spontaneously. Rest and ibuprofen usually resolves either of these over the course of a few days.
Regardless, your son should see a doctor as soon as possible.
Sorry for the typos. I was trying to type as quickly as possible because I am concerned about your son's symptoms.
Just wanted to follow up. I hope everything went ok at your son's doctor visit.
Glad to hear it. I wish him the best!