Owing to the mobility of the testicles, as well as to their adequate scrotal coverings and their location between the fleshy parts of the thighs, injury to them is relatively infrequent. That many persons receive injuries for which they do not seek medical aid is no doubt true. Several cases of traumatic epididymo-orchitis have come under my observation. Most of the patients were young adults, the youngest a boy of 12. Several varieties of trauma were involved, baseball injuries being the most common. Injuries from wrestling and from striking the handles of lawn mowers were observed. For the most part, the injuries I have seen have been of no unusual moment. None required any type of surgical intervention. I have been able to observe only a few patients at periods after the injury; in none did atrophy of the testicle occur. However, this complication is not uncommon after such injuries.