What symptom did Greg Snyder experience that prompted his visit to the emergency department?

Greg Snyder's visit to the emergency department was prompted by substernal chest pain, which is often associated with potential cardiac issues or other serious conditions that require immediate medical attention. Chest pain is a classic symptom that raises concern for conditions such as myocardial infarction (heart attack) or angina, making it a critical warning sign.

In emergency settings, substernal chest pain is prioritized for assessment because it can indicate life-threatening problems. The urgency surrounding this symptom often leads to swift evaluation and intervention to determine the underlying cause, which could be vital for patient survival.

Other symptoms mentioned, such as diarrhea, abdominal pain, or shortness of breath, while potentially serious in their own right, do not carry the same immediate implications for critical cardiac events as substernal chest pain does. This helps clarify why the focus is on the chest pain in this scenario.