Heartburn is a burning sensation in the middle of your chest, caused by stomach acid washing back up into the tube that connects your throat to your stomach. It can range from a mild warmth behind your breastbone to a sharp, searing pain that radiates upward into your throat. About one in four adults experiences it at least weekly.
Where You Feel It and What It’s Like
The burning starts behind your breastbone, roughly in the center of your chest. From there it often spreads upward, sometimes reaching the base of your throat. Some people describe it as a hot, acidic pressure. Others say it feels more like a tight ache that mimics chest pain. The intensity varies widely: a mild episode might feel like warmth after a spicy meal, while a severe one can be painful enough to wake you from sleep.
Along with the burn, you may notice a sour or bitter taste in your mouth, especially when lying down. That taste comes from small amounts of stomach contents creeping up into the back of your throat, a symptom called regurgitation. Some people also experience something called water brash, where the salivary glands kick into overdrive, flooding your mouth with up to two teaspoons of saliva per minute as acid rises. It can feel like liquid is stuck in the back of your throat.
When It Typically Hits
Heartburn tends to follow patterns. The most common trigger is eating a large, rich meal. Fatty and fried foods sit in the stomach longer, which gives acid more opportunity to escape upward. Lying down too soon after dinner is another classic setup, because gravity is no longer helping keep stomach contents where they belong. If you eat a heavy dinner and go to bed within a couple of hours, the odds of nighttime heartburn go up considerably.
Bending over can also bring it on. Any position that puts pressure on your stomach or tilts your body so acid can flow the wrong direction makes symptoms more likely. That’s why many people notice heartburn while gardening, tying shoes, or doing floor exercises after a meal.
What Causes the Burning
At the bottom of your esophagus sits a ring of muscle that acts like a one-way valve. It opens to let food into your stomach and closes to keep acid from traveling back up. When that valve relaxes at the wrong time, or doesn’t close tightly enough, stomach acid escapes into the esophagus. Your stomach lining is built to handle acid. Your esophagus is not. The burning you feel is acid directly irritating tissue that has no protection against it.
The longer acid sits in contact with esophageal tissue, the worse the discomfort. Your body clears the acid by swallowing saliva and through muscular contractions in the esophagus, but that process takes time. People who experience reflux frequently may develop ongoing irritation or inflammation in the esophagus, which is why persistent heartburn is worth paying attention to.
Foods and Drinks That Make It Worse
Certain foods are especially good at provoking heartburn:
- Fatty and fried foods slow digestion, keeping your stomach full longer and giving acid more chances to escape
- Spicy foods, citrus, tomato sauces, and vinegar can intensify the burning sensation directly
- Chocolate, caffeine, peppermint, and alcohol relax the valve at the base of the esophagus, making reflux more likely
- Carbonated drinks and onions are also common culprits
Triggers vary from person to person. Some people can drink coffee without issue but get heartburn from tomato sauce. Paying attention to which foods consistently cause problems for you is more useful than avoiding every item on a generic list.
How Sleeping Position Affects It
If heartburn is waking you up at night, your sleeping position matters. Research from Harvard Health found that sleeping on your left side doesn’t reduce the number of reflux episodes, but it significantly speeds up how fast acid clears from the esophagus compared to sleeping on your back or right side. Less acid exposure means less pain and less risk of tissue damage over time.
Elevating the head of your bed by a few inches can also help. Propping yourself up with pillows alone usually isn’t enough, because it bends your body at the waist rather than creating a gradual slope. A foam wedge or blocks under the bedframe legs work better.
Heartburn vs. Heart Attack
Heartburn and heart attacks can feel alarmingly similar. Even doctors sometimes can’t tell the difference based on symptoms alone. But there are patterns that help distinguish them.
Heartburn typically produces a burning sensation that starts after eating or while lying down. It often comes with a sour taste, responds to antacids, and doesn’t cause shortness of breath or cold sweats. A heart attack is more likely to feel like pressure, tightness, or squeezing in the chest that may spread to the neck, jaw, or arms. It often comes with lightheadedness, cold sweat, nausea, or sudden fatigue.
Women are more likely than men to experience less obvious heart attack symptoms like jaw pain, back pain, and nausea without the classic crushing chest pressure. If you have persistent chest pain and you’re not sure what’s causing it, treat it as a cardiac emergency. Both heartburn and a developing heart attack can produce symptoms that come and go, so the fact that pain subsides does not rule out a cardiac event.
When Heartburn Points to Something More
Occasional heartburn after a big meal is common and generally not a cause for concern. When it happens twice a week or more, it may indicate gastroesophageal reflux disease (GERD), a chronic condition where the valve at the base of the esophagus isn’t functioning properly. Population studies put the prevalence of weekly heartburn or regurgitation between 12% and 31% of adults, so it’s far from rare.
Certain symptoms alongside heartburn signal that something beyond routine reflux may be going on. Difficulty swallowing, a sensation of food getting stuck in your throat, frequent choking or coughing while eating, or a wet, gurgly voice after meals all warrant a closer look. Unintentional weight loss or repeated chest infections alongside reflux symptoms are also red flags. These can point to esophageal narrowing, inflammation, or other complications that benefit from early evaluation.