Every year, millions of people with non-cardiac chest pain end up in emergency rooms — and a smaller, far more dangerous group mistake a heart attack for indigestion and stay home. The overlap is real: heartburn can feel like crushing chest pressure, and cardiac pain can burn like acid. Here are the evidence-based clues that separate the two.
The Overlap Problem
Studies of patients presenting to emergency departments with chest pain consistently find that gastroesophageal reflux disease (GERD) is among the top non-cardiac causes — often alongside musculoskeletal strain and anxiety. Meanwhile, roughly 30% of heart attacks present with atypical symptoms that don't match the classic "crushing pain" script, especially in women, people with diabetes, and older adults.
Cardiac Chest Pain: What It Usually Feels Like
Angina and heart attack pain classically have a pressure, squeezing, heaviness, or tightness quality — many patients describe an "elephant sitting on my chest." Key features to look for:
- Location: center or left chest, often radiating to the left arm, jaw, neck, back, or both arms
- Triggers: brought on or worsened by exertion, stress, or cold; relieved by rest (angina)
- Duration: sustained — minutes of steady pressure, not a sharp seconds-long jab
- Accompanying symptoms: shortness of breath, cold sweat, nausea, lightheadedness, or unexplained fatigue
Heartburn: What Acid Reflux Usually Feels Like
GERD-related pain typically has a burning character that rises from the stomach toward the throat — the classic "heartburn" behind the breastbone:
- Timing: most common after meals, when lying down, or bending over, and at night
- Associated signs: sour or bitter taste in the mouth, regurgitation, belching, a feeling of a lump in the throat
- Relief: often improved by antacids (e.g., Tums, Gaviscon) or an upright posture
The "Don't Drive Yourself" Rule
The most important advice is also the simplest: when in doubt, err on the side of the emergency room. You cannot reliably self-diagnose the difference — even experienced cardiologists initially misclassify some cases. If your chest pain is new, severe, persistent, or comes with shortness of breath, sweating, or nausea, call emergency services and do not drive yourself. Antacids working quickly does not rule out cardiac disease — up to 25% of people presenting with heart attacks had tried antacids first.
Red Flags: Seek Emergency Care Immediately
- Crushing pressure or tightness lasting more than a few minutes
- Pain spreading to the arm, jaw, neck, or back
- Shortness of breath, cold sweats, nausea, or lightheadedness with the pain
- New chest discomfort with exertion that stops when you rest
- Known heart disease or major risk factors (diabetes, smoking, high blood pressure, family history) plus any unexplained chest discomfort
The Bottom Line
Burning that follows meals, worsens when you lie down, and melts away with an antacid points toward reflux. Pressure that spreads to your arm or jaw, comes with sweating or breathlessness, and appears with exertion points toward the heart. But the overlap is wide enough that the safest algorithm is simple: for any severe, persistent, or unusual chest pain, get evaluated — every time. There is no downside to a "false alarm," and a very real downside to guessing wrong.