Heartburn feels like a burning pain in the chest, centered just behind the breastbone. It typically starts within an hour of eating and lasts anywhere from 30 minutes to two hours. The sensation can range from a mild warmth to an intense, uncomfortable burn that radiates upward from your stomach toward your throat. If you’re feeling something in your chest and trying to figure out whether it’s heartburn, the details below will help you match your symptoms.
The Core Sensation
The hallmark of heartburn is a burning feeling that sits behind the sternum, the flat bone running down the center of your chest. It doesn’t feel sharp or stabbing. Instead, it’s more like a slow, spreading heat that starts in the upper abdomen and climbs upward. Some people describe it as a hot, acidic pressure behind the chest wall.
This burning happens because stomach acid is flowing backward into the esophagus, the tube connecting your throat to your stomach. The esophagus doesn’t have the same protective lining your stomach does, so even small amounts of acid create that characteristic burn. The pain tends to sit in one general area rather than radiating outward to your arms, shoulders, or jaw.
What Else You Might Feel
Heartburn rarely shows up as just a chest burn. Most episodes come with a few companion sensations that help distinguish it from other types of chest discomfort.
- Sour or acidic taste: Stomach contents can travel far enough up the esophagus to reach the back of your throat or mouth. This is called regurgitation, and it leaves a bitter or sour flavor that’s hard to miss.
- Throat irritation: That same acid can make your throat feel raw, scratchy, or like something is stuck in it.
- A feeling of fullness or pressure: The burning often comes alongside a sense of tightness or bloating in the upper chest and stomach area, especially after a large meal.
These additional symptoms tend to confirm that what you’re feeling is acid-related rather than cardiac. The sour taste, in particular, is a strong indicator of heartburn.
How Body Position Changes the Pain
One of the most distinctive features of heartburn is how much worse it gets when you change position. Lying down or bending over intensifies the burn noticeably, because gravity is no longer helping keep stomach acid where it belongs. Many people first notice heartburn at night after going to bed with a full stomach, when the burning wakes them up or makes it hard to fall asleep.
If you’re lying flat and the chest pain gets significantly worse, that’s a strong clue it’s heartburn. Sitting upright or standing usually brings some relief within minutes. Sleeping on your left side can also help, because that position keeps the valve between your esophagus and stomach above the level of your stomach contents, making it harder for acid to escape upward. Lying on your back or right side does the opposite.
Timing and Duration
Heartburn episodes follow a predictable pattern tied to eating. Symptoms usually begin within an hour of a meal, particularly meals that are large, fatty, or heavily spiced. A mild episode lasts between 30 and 120 minutes. More severe or frequent episodes, especially those happening multiple times a week, may point to gastroesophageal reflux disease (GERD), a chronic form of acid reflux.
Over-the-counter antacids can neutralize stomach acid and relieve symptoms within minutes, which is another way to confirm that what you felt was heartburn. If the burning doesn’t respond to antacids at all, that’s worth paying attention to.
How It Differs From a Heart Attack
This is the question behind the question for many people searching this topic, and it’s a fair one. Heartburn and heart attacks can both cause chest pain, but the sensations are different in important ways.
Heartburn produces a burning feeling that’s connected to eating, gets worse when you lie down, and often comes with a sour taste. It stays centered behind the breastbone. A heart attack, by contrast, feels more like pressure, tightness, squeezing, or aching in the chest. The pain frequently spreads to the shoulder, arm, back, neck, or jaw. It may come with shortness of breath, cold sweats, or fatigue, and it’s not triggered by meals or relieved by changing position.
In women, heart attack symptoms can be less obvious. Rather than crushing chest pain, women more often experience nausea, or a brief, sharp pain in the neck, arm, or back. If your chest pain comes with any combination of spreading pain, difficulty breathing, or sudden sweating, call emergency services. Heartburn is uncomfortable but not dangerous. The priority is making sure you’re not dealing with something that is.
What Makes Heartburn Worse
Certain habits and foods reliably trigger or intensify that chest burn. Eating large portions, eating close to bedtime, or consuming acidic, spicy, or high-fat foods are the most common culprits. Alcohol, coffee, chocolate, and citrus are frequent offenders. Smoking weakens the valve at the top of the stomach, making reflux more likely.
Tight clothing around the waist can increase abdominal pressure and push acid upward. So can excess body weight, which puts constant pressure on the stomach. Waiting three to five hours after eating before lying down is one of the most effective ways to prevent nighttime episodes. Small changes to meal timing and portion size often reduce heartburn frequency more than any single medication.