Which of the following conditions requires immediate medical attention?

Chest pain lasting more than a few minutes necessitates immediate medical attention because it could indicate a serious underlying condition such as a myocardial infarction (heart attack) or angina. These conditions can lead to significant morbidity or mortality if not addressed quickly. Prompt evaluation and treatment are crucial in managing potential life-threatening cardiovascular issues, which makes chest pain a red flag that should never be ignored. Rapid response can mean the difference between life and death, so it's essential to treat this symptom with the seriousness it deserves.

In contrast, mild allergic reactions, slight headaches, and minor burn injuries, while they can indeed warrant attention, typically do not carry the same immediate life-threatening implications that require urgent care like severe chest pain does. These other options may allow for monitoring or delayed treatment in many cases, depending on their severity and accompanying symptoms.