Objectives: To identify violence related behaviors associated with injuries among adolescent males involved in fights.

Methods: Data from the National Longitudinal Study of Adolescent Health were used to develop weighted estimates of injury prevalence and associations between injury and violence related behaviors.

Results: Forty seven per cent injured others and 18% were themselves injured in a fight among adolescent males in the preceding 12 months. Group fighting, fighting with strangers, and weapon use were predictive of injury in this sample.

Conclusions: These findings suggest that injuries associated with fighting are a health risk among adolescent males. Certain behaviors, such as fighting in groups and fighting with strangers, increase the likelihood of injuries requiring medical attention.