Orchitis

Inflammation of one or both testes, and characterized clinically by testicular pain, swelling, and tenderness. Most often due to viral infaction (mumps, rubella, varicella, cytomegalovirus, echovirus) or bacterial infection (Chlamydia trachomatis, Neisseria gonorrhoeae, Escherichia coli, Staphylococcus, Streptococcus).