Epididymo-orchitis is a condition that presents with pain in the scrotum, often accompanied by swelling. It needs to be differentiated from torsion of the testis by scrotal ultrasound scan. It may be associated with a urethral discharge, dysuria and frequency.
Causative organisms are either from the urinary tract or are sexually transmitted. For patients aged under 35 years, consider treatment for STIs. For patients over 35 years, consider examining for urine pathogens.