Chest pain has dozens of possible causes, and most of them are not life-threatening. Fewer than 10% of people who go to the emergency department with chest pain are ultimately diagnosed with a serious cardiac event like a heart attack. That said, chest pain is one symptom you should never try to diagnose on your own, because the dangerous causes require fast treatment. Here’s what can trigger it and how to tell the difference.
Heart-Related Causes
The most urgent causes of chest pain involve the heart. A heart attack happens when blood flow to part of the heart muscle gets blocked, usually by a clot in a narrowed coronary artery. The pain typically feels like pressure, squeezing, or heaviness behind the breastbone, and it can spread to the left arm, jaw, neck, or back. It often comes on during physical exertion or emotional stress, though it can also strike at rest.
Unstable angina produces similar symptoms but without permanent damage to the heart muscle. It’s a warning sign that a heart attack may be close. Stable angina, by contrast, is predictable chest pain that shows up with exercise and goes away with rest. It signals that the heart’s arteries are partially blocked but not critically so.
Pericarditis, an inflammation of the thin sac surrounding the heart, causes sharp chest pain that often worsens when you lie down or take a deep breath and improves when you lean forward. It can feel similar to a heart attack but tends to come on more gradually. Aortic dissection is rarer but extremely dangerous. It produces a sudden, tearing pain in the chest or between the shoulder blades and is more common in people with high blood pressure, hardened arteries, or a history of heart surgery.
Digestive Causes
Chronic acid reflux (GERD) is the single most common cause of non-cardiac chest pain, and one of the most common causes of chest pain overall. When stomach acid backs up into the esophagus, it burns the lining, and because the esophagus runs right through your chest, you feel that burn behind your breastbone. It can be surprisingly intense, mimicking the squeezing or burning quality of heart pain. Many people experiencing their first episode of bad reflux genuinely believe they’re having a heart attack.
Esophageal spasms, where the muscles of the esophagus contract abnormally, can also produce sudden, severe chest pain along with difficulty swallowing. Peptic ulcers and gallbladder problems are less common culprits, but both can send pain into the chest or upper abdomen in a way that overlaps with cardiac symptoms.
Lung-Related Causes
Lung problems tend to cause a distinctive type of chest pain called pleuritic pain, which is sharp and gets worse when you breathe in or cough. Nearly 90% of people with a collapsed lung (pneumothorax) experience this kind of pain, and about half of people with pneumonia do as well.
A pulmonary embolism, a blood clot that travels to the lungs, is the most common life-threatening cause of pleuritic chest pain. It occurs in 5% to 20% of patients evaluated for this type of pain. About 75% of people with a pulmonary embolism and fluid around the lungs report sharp, breathing-related chest pain, often alongside sudden shortness of breath and a rapid heart rate. Risk goes up after surgery, long periods of immobility, or if you take certain hormonal medications.
Muscle and Bone Causes
Costochondritis, inflammation of the cartilage connecting your ribs to your breastbone, is one of the most frequent causes of chest pain in outpatient settings. It produces a localized tenderness that you can usually reproduce by pressing on the affected spot. It often follows heavy lifting, a new exercise routine, or even a bad cough.
Strained chest wall muscles can cause similar pain. The key feature of musculoskeletal chest pain is that it changes with position or movement. Twisting your torso, reaching overhead, or pressing on the sore area makes it worse, which is generally not the case with heart-related pain.
Anxiety and Panic Attacks
Chest pain shows up in 22% to over 70% of panic attacks, making it one of the most common non-cardiac causes. The mechanism is more complex than just “stress.” During a panic attack, rapid breathing causes changes in blood chemistry that can trigger spasms in the small muscles between the ribs. The surge of adrenaline also increases resistance in tiny coronary blood vessels, which can briefly reduce blood flow to the heart itself. So the pain is real and physical, not imagined.
Chronic anxiety can also cause esophageal spasms by disrupting the normal muscle contractions of the digestive tract. On top of that, people with anxiety disorders tend to interpret normal body sensations as more painful than they otherwise would, which can create a feedback loop where worry about chest pain makes the pain feel worse.
How to Tell the Difference
Cardiac chest pain classically has three features: it feels like pressure or heaviness behind the breastbone, it’s triggered by exertion, emotion, cold air, or a large meal, and it improves with rest. Pain that checks two of those boxes is considered likely cardiac. Pain with one or none is more likely non-cardiac. But this is a guideline, not a rule. Non-cardiac chest pain from acid reflux or esophageal spasms can produce squeezing or burning that radiates to the back, neck, arms, and jaw, making it genuinely indistinguishable from heart pain without testing.
Women in particular often experience heart attacks differently. While chest pain is still the most common symptom for both sexes, women are more likely to have pain in the neck, jaw, upper back, or stomach instead of, or in addition to, classic chest pressure. They also report nausea, unusual fatigue, and shortness of breath more often than men, and their symptoms are more likely to appear at rest or during sleep rather than during physical activity. People with diabetes face a similar challenge: nerve changes from diabetes can blunt pain signals, leading to “silent” heart attacks with minimal or no chest pain at all.
What Happens When You Get Evaluated
When you arrive at an emergency department with chest pain, two tests happen fast. An ECG (a recording of your heart’s electrical activity) should be completed within 10 minutes. A blood draw for troponin, a protein released when heart muscle is damaged, happens without delay. Newer high-sensitivity troponin tests can effectively rule out a heart attack within one to three hours, compared to three to six hours with older tests. When troponin levels stay below a certain threshold across two measurements, the chance of heart attack or death within 30 days is less than 0.5%.
A chest X-ray helps identify lung problems like pneumonia, a collapsed lung, or fluid buildup. If these initial tests come back normal, the focus shifts to non-cardiac causes. Your doctor may ask about the timing of the pain relative to meals, whether it changes with breathing or body position, and whether you’ve been under unusual stress. These details help narrow down whether the source is digestive, musculoskeletal, or anxiety-related.
Red Flags That Need Immediate Attention
Certain combinations of symptoms suggest a cardiac emergency. Chest pressure or squeezing accompanied by pain spreading to the arm, jaw, or back. Sudden shortness of breath, especially if you’re gasping or can’t catch your breath. Breaking into a cold sweat with clammy skin. Feeling dizzy or lightheaded to the point of nearly passing out. Nausea or vomiting alongside chest discomfort. A sudden sense of dread or doom.
These symptoms don’t guarantee a heart attack, but they overlap heavily with how heart attacks present, and the treatment window is narrow. If you experience this combination, calling emergency services is the right move. People who arrive by ambulance receive faster evaluation than those who walk in.