Pain in the testicle when touched can be caused by various conditions, ranging from minor issues to serious medical emergencies. Common causes include infections such as epididymitis (inflammation of the epididymis), minor trauma or strain, cysts like spermatocele or hydrocele, varicocele (swollen veins in the scrotum), or testicular torsion, which is a medical emergency requiring immediate treatment because it cuts off blood supply to the testicle. Infections often cause tenderness, swelling, and a feeling of warmth, while trauma can cause pain due to injury. If the pain is severe, sudden, or accompanied by swelling, redness, or other symptoms like nausea, urgent medical attention is needed to prevent lasting damage.

If the pain occurs only when touched and is mild, it could still indicate tenderness from minor injury or inflammation. However, if the pain persists, worsens, or is associated with other symptoms such as lumps or swelling, it is important to consult a healthcare provider for proper diagnosis and treatment.