Heartburn and cardiac chest pain can feel remarkably similar, and there’s a biological reason for that: the esophagus and heart share overlapping nerve pathways in the spinal cord. About 30% of the spinal neurons that receive signals from the esophagus also respond to signals from the heart, which means your brain genuinely struggles to tell the two apart. That said, there are practical differences in how each one feels, what triggers it, and what other symptoms come along with it.
Roughly 50 to 75% of people who go to an emergency department for chest pain end up with a non-cardiac diagnosis. So if you’re feeling chest discomfort and wondering whether it’s your stomach or your heart, you’re far from alone.
How Each Type of Pain Feels
Heartburn typically produces a burning sensation behind your breastbone that can extend up into your upper abdomen. It often comes with a sour or acidic taste in your mouth, and you may notice small amounts of stomach contents rising into the back of your throat. The discomfort tends to stay in the center of the chest and may creep upward toward your throat, but it doesn’t usually spread to your shoulders, arms, or back.
Cardiac chest pain feels different. The classic description is pressure, tightness, or a squeezing, aching sensation in the chest. Rather than burning, people often describe it as heavy, like something sitting on their chest. The pain frequently radiates outward to the neck, jaw, back, or one or both arms. It may also come with shortness of breath, lightheadedness, a cold sweat, or unusual fatigue.
Triggers Tell You a Lot
One of the most useful ways to separate the two is by thinking about what you were doing when the pain started. Heartburn tends to show up after a large meal, a spicy or fatty meal, or when you lie down or bend over. It’s tied to digestion. The pain often worsens in certain body positions because stomach acid moves more easily into your esophagus when you’re not upright.
Heart-related chest pain, on the other hand, is more likely to appear during or after physical exertion, emotional stress, or sudden activity. If you were climbing stairs, exercising, or in the middle of a stressful situation when the pain hit, that pattern points more toward a cardiac cause. Rest or stopping the activity sometimes eases cardiac pain, while heartburn tends to respond to sitting upright or taking an antacid.
Why Antacids Don’t Rule Out a Heart Problem
A common assumption is that if antacids relieve the pain, it must be heartburn. This is unreliable. Systematic reviews of emergency department data show that symptom improvement after an antacid or a “GI cocktail” (a mix of antacid, numbing agent, and sometimes an anti-spasm medication) does not reliably rule out a heart attack. Some people with active cardiac events experience partial relief from antacids, and some people with acid reflux get no relief at all. Feeling better after an antacid is a clue, not a diagnosis.
Symptoms That Signal an Emergency
Certain symptoms alongside chest pain should prompt immediate medical attention, regardless of whether you think it’s heartburn:
- Pain spreading to your arms, shoulders, neck, jaw, or back
- Shortness of breath, which can appear before chest pain starts
- Cold sweat, lightheadedness, or feeling faint
- Nausea or vomiting combined with chest tightness
- Unexplained fatigue that feels sudden or out of proportion
The tricky part is that a heart attack can also cause nausea, indigestion, and abdominal pain, symptoms that overlap directly with heartburn. This is one of the main reasons the two get confused. If your chest discomfort came on suddenly, feels unusually intense, or is accompanied by any of the symptoms above, treat it as a cardiac event until proven otherwise.
How Symptoms Differ in Women
Women are less likely to experience the “textbook” heart attack of sudden crushing chest pain. While chest pain and pressure remain the most common symptoms for both sexes, men report chest pain as their primary complaint about 13 to 15% more often than women do. Women more frequently describe pain in the jaw, neck, upper back, left shoulder, or abdomen. They’re also more likely to experience nausea, vomiting, dizziness, shortness of breath, and an overwhelming sense of dread.
As women age, chest pain becomes an even less prominent feature of heart attacks, while shortness of breath becomes more common. This pattern doesn’t hold for men. The takeaway is that women experiencing unusual upper body pain, nausea, or sudden breathlessness shouldn’t dismiss these symptoms just because they don’t feel like classic chest pain.
Esophageal Spasms: The Third Possibility
Not every chest pain that isn’t a heart attack is heartburn. Esophageal spasms, sudden involuntary contractions of the muscles in your esophagus, can produce intense squeezing chest pain that feels almost identical to a heart attack. The pain can last from a few minutes to hours. Unlike typical heartburn, esophageal spasms don’t always produce the burning sensation or sour taste that helps identify acid reflux. And unlike cardiac pain, they’re not consistently tied to exertion.
Gallbladder disease is another mimic. It can cause an intense, steady ache in the upper abdomen that spreads to the chest, shoulders, neck, or arms, especially after eating fatty foods. If your chest pain follows fatty meals specifically and sits more in the upper right abdomen, your gallbladder is worth investigating.
A Quick Comparison
- Sensation: Heartburn burns. Cardiac pain squeezes, presses, or aches.
- Location: Heartburn stays central and may rise toward the throat. Cardiac pain can spread to the arms, jaw, neck, or back.
- Triggers: Heartburn follows meals, lying down, or bending over. Cardiac pain follows exertion or stress.
- Accompanying symptoms: Heartburn brings a sour taste or regurgitation. Cardiac pain brings shortness of breath, cold sweats, or lightheadedness.
- Position changes: Heartburn often worsens when lying flat and improves when sitting up. Cardiac pain doesn’t respond predictably to changing positions.
These patterns hold in typical cases, but the overlap is real and well-documented. Roughly one in three spinal nerve cells that process esophageal signals also process cardiac signals, which is why even experienced clinicians rely on ECGs and blood tests rather than symptoms alone. If there’s any doubt, especially if the pain is new, severe, or accompanied by the red-flag symptoms listed above, err on the side of getting it checked out.