Heartburn is a burning sensation in the middle of your chest, typically behind the breastbone. It can range from a mild warmth to a sharp, intense pain that radiates upward toward your throat. If you’ve never experienced it before, the feeling can be alarming because it sits right where your heart is, but heartburn has nothing to do with your heart. It’s caused by stomach acid washing back up into your esophagus, the tube that connects your mouth to your stomach.
The Core Sensation
Most people describe heartburn as a burning or hot feeling that starts in the upper stomach area and rises into the chest. Some feel it as tightness or pressure rather than burning, which is why it’s sometimes confused with heart-related chest pain. The intensity varies widely. A mild episode might feel like a warm discomfort after a big meal, while a severe one can produce sharp pain that makes it hard to focus on anything else.
The burning usually begins within an hour of eating, especially after large, fatty, or spicy meals. It tends to get worse when you bend over or lie down, because both positions make it easier for acid to flow upward past the valve at the top of your stomach. An episode can last anywhere from a few minutes to a couple of hours.
Where the Pain Travels
Heartburn typically starts behind the breastbone but doesn’t always stay there. The burning can creep up into your throat, and when it does, you may notice a sour or bitter taste in the back of your mouth. This happens when a mixture of saliva and stomach acid reaches the upper throat, a symptom sometimes called water brash. It can feel like liquid is stuck in the back of your throat, and the taste is distinctly acidic.
Some people also experience a scratchy or raw feeling in the throat, hoarseness, or a persistent cough that seems unrelated to a cold. These are all signs that acid is reaching areas it shouldn’t.
Why It Gets Worse at Night
Heartburn often flares up after you go to bed. When you’re upright during the day, gravity helps keep stomach acid where it belongs. Lying flat removes that advantage, and acid can pool around the valve at the top of your stomach more easily. This is why nighttime heartburn tends to feel more intense and last longer than daytime episodes.
Sleeping position matters more than most people realize. Lying on your right side or flat on your back submerges that valve in stomach contents, increasing the chance of acid escaping upward. Sleeping on your left side positions the valve in an air pocket above the stomach’s contents, which makes reflux less likely. Eating several hours before bed also helps, since a full stomach produces more acid and puts more pressure on the valve.
Heartburn vs. Heart Attack Pain
Because heartburn sits in the center of the chest, many people worry they’re having a heart attack. There are real differences, but they can be subtle. Heartburn pain is usually relieved by antacids, gets worse after eating or when lying down, and has a burning quality. A heart attack more commonly involves sudden, crushing chest pain and difficulty breathing, often triggered by physical exertion rather than food.
That said, the overlap between the two is real. Heartburn can produce chest pain that feels like squeezing or tightening, which mimics the classic description of cardiac pain. If you experience chest pain along with shortness of breath, pain radiating into your arm or jaw, lightheadedness, or cold sweats, treat it as a potential heart emergency regardless of whether you think it might be heartburn.
Occasional Heartburn vs. Chronic Reflux
Nearly everyone experiences heartburn at some point, and an occasional episode after a holiday meal or a night of heavy eating is normal. It becomes a medical concern when it happens regularly. Over 60 million people in the United States experience reflux symptoms at least once a week, and frequent heartburn is the hallmark of gastroesophageal reflux disease, or GERD. The initial diagnosis is typically based on symptoms alone: if you have recurring heartburn and regurgitation, that pattern correctly identifies GERD about 70% of the time.
The distinction matters because chronic acid exposure can damage the lining of the esophagus over time. If heartburn becomes a weekly occurrence rather than a rare annoyance, it’s worth addressing rather than just tolerating.
Symptoms That Signal Something More Serious
Certain symptoms alongside heartburn point to possible complications. Difficulty swallowing, a feeling that food is getting stuck in your chest or throat, unexplained weight loss, or vomiting with blood are all signs that acid damage may have progressed beyond simple irritation. Chronic difficulty swallowing can lead to malnutrition and dehydration if food intake drops, and in some cases increases the risk of food or liquid entering the airway.
Persistent hoarseness, a chronic cough that doesn’t respond to typical cold remedies, or food regularly coming back up into your throat also suggest that reflux is affecting areas beyond the esophagus. These patterns warrant investigation rather than continued self-treatment with over-the-counter antacids.