Final answer:
Falls are the most common cause of emergency room visits due to injuries in both younger children and older adults, often leading to brain injuries. Other severe causes of death in young children, particularly in low-income countries, include various preventable diseases and birth-related complications.
Step-by-step explanation:
The most common cause of injury-related emergency room visits for younger children and older adults is falls, which can result in head and traumatic brain injuries. In children under five, particularly in low-income countries, the leading causes of death include pneumonia, diarrhea, congenital anomalies, preterm birth complications, and birth asphyxia/trauma, which can be addressed with preventative measures and basic healthcare.
However, when considering injuries specifically, falls remain the predominant cause for emergency department visits. While older adults and young children are more susceptible to falls, adolescents can also suffer brain injuries through automobile accidents, sports injuries, and violence.