Pain starts suddenly, scrotum is tender, swells and becomes red.
Testis tends to be drawn up high in scrotum. No urinary symptoms. Pain increases when you try to elevate scrotum. Cremaster reflex (muscle that pulls up testis) is usually lost on affected side. Torsion is an emgergency and needs to be corrected asap. Acute scrotakl pain most always be considered torsion until proven otherwise.