What causes orchitis in a 10 year old?

Orchitis in a 10-year-old can be caused by viral infections, most commonly mumps, especially in children who are unvaccinated. Bacterial infections, such as those resulting from sexually transmitted infections or urinary tract infections, can also lead to orchitis, though these are less common in prepubescent boys. Trauma or injury to the groin area may also contribute to the condition. It's important for a healthcare provider to evaluate any symptoms to determine the underlying cause and appropriate treatment.