Final answer:
The leading cause of death among adolescent males globally is road traffic injuries, which often lead to head and traumatic brain injuries.
Step-by-step explanation:
The leading cause of death among adolescent males globally is road traffic injuries. This type of injury often results in head and traumatic brain injuries, which, according to the Centers for Disease Control and Prevention, are major causes of death and disability. While drowning and self-harm are also serious concerns, road traffic injuries surpass them as the top cause of death in this demographic. Additionally, it's worth noting that in high-income countries, a significant number of deaths are linked to cancer and drug overdoses, but these do not lead in the adolescent male category globally.