Pain in the testicles is a common symptom that can be caused by a variety of medical conditions. It can be a sharp, dull, or burning sensation that can be localized or diffuse. It can range from mild to severe and can come on suddenly or gradually. It can be accompanied by other symptoms such as swelling, tenderness, or changes in the size of the testicles. It can be caused by infection, inflammation, trauma, or a tumor. It is important to seek medical attention if the pain persists or worsens.