Brief Answer: Considerations Detailed Answer: Hello and thank you for sending your question. This is most certainly a situation that requires a physical examination by a medical doctor. I urge you to schedule an appointment as soon as possible with a pediatrician or family medicine physician. There are several conditions, benign and otherwise, that can cause one-sided testicle swelling. A hernia is certainly a consideration, but cannot be ruled out without a physical examination. This is why it is very important to have your son seen by a physician as soon as possible. Again, thank you for submitting your question and I hope you will be able to follow up as recommended. Sincerely, Dr. G

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