Orchitis is an acute inflammatory reaction of the testis secondary to infection. While the more common epididymo-orchitis is bacterial in origin, isolated orchitis usually has a viral etiology. This condition rarely occurs in postpubertal males with mumps.
Bacterial orchitis is even more rare and is usually associated with a concurrent epididymitis.
Sterility is rarely a consequence of unilateral orchitis. Despite some anecdotal reports, little evidence supports an increased likelihood of developing a testicular tumor after an episode of orchitis. Orchitis is characterized by testicular pain and swelling. The course is variable and ranges from mild discomfort to severe pain. Associated systemic symptoms Fatigue Malaise Myalgias Fever and chills Nausea Headache Mumps orchitis follows the development of parotitis by 4-7 days.