Which symptom indicates a possible sudden illness that may require urgent care?

Chest pain is a significant symptom that often indicates a potential acute medical emergency, especially if it is severe or accompanied by other distressing signs such as shortness of breath, dizziness, or radiating pain. It could suggest serious conditions like a heart attack, angina, or other cardiovascular issues that require immediate medical evaluation and intervention. Recognizing this symptom is crucial in emergency situations as timely treatment can be life-saving.

In contrast, while fatigue can indicate various health issues, it is not necessarily urgent by itself. Extreme thirst can be a symptom of conditions like dehydration or diabetes but does not always require immediate care. A runny nose is typically associated with minor ailments such as allergies or colds, which are not urgent. Thus, chest pain stands out as the most urgent symptom necessitating immediate attention.