Which injuries require immediate medical assistance?

The presence of severe bleeding, chest pain, and difficulty breathing indicates conditions that can rapidly escalate and become life-threatening if not addressed immediately.

Severe bleeding can lead to significant blood loss and shock, which requires urgent intervention to control the bleeding and stabilize the individual. Chest pain could be indicative of serious cardiac issues, including a heart attack, where timely treatment can make a critical difference in outcomes. Difficulty breathing may suggest respiratory distress or an obstructed airway, both of which are emergencies that need prompt medical care to avoid severe complications or death.

In contrast, the other options involve conditions that, while they may require attention, do not typically represent immediate threats to life or require urgent medical intervention. Minor cuts and bruises can often be managed at home, muscle strains, though painful, usually warrant rest and simple home care, and common headaches or stomach aches can often be treated with over-the-counter medications and do not generally constitute emergencies. Therefore, the need for immediate medical assistance is clearly illustrated by the critical nature of the injuries described in the correct option.