Heartburn is a burning sensation in the center of your chest, usually behind the breastbone, that can travel upward toward your throat. It often starts after eating and may come with a sour or acidic taste in your mouth. About one in four adults experiences heartburn at least once a week, making it one of the most common digestive complaints.
Despite the name, heartburn has nothing to do with your heart. It happens when stomach acid flows backward into the esophagus, the tube connecting your mouth to your stomach. The esophagus lacks the protective lining your stomach has, so even small amounts of acid create a noticeable burning feeling.
The Burning Sensation and Where You Feel It
The hallmark of heartburn is a warm or burning feeling that starts in your upper abdomen and rises into your chest. Some people describe it as a hot, stinging pressure right behind the breastbone. It can range from mildly uncomfortable to sharp enough to make you stop what you’re doing. The sensation sometimes climbs into the lower throat, creating the feeling that something warm is sitting at the back of your mouth.
Unlike a deep, muscular ache, heartburn tends to feel superficial, almost like the inside of your chest is irritated. Swallowing can temporarily feel scratchy or raw during an episode, especially if acid has reached the upper esophagus. Many people notice it most within the first hour or two after a meal, particularly a large or fatty one.
Sour Taste and Regurgitation
Alongside the burning, you may get a sour or bitter taste in your mouth. This happens when small amounts of stomach acid or partially digested food rise into the back of your throat. The taste is distinctly acidic, not metallic, and it can linger even after the burning subsides.
Some people experience what’s called water brash: a sudden flood of saliva mixed with stomach acid. Your salivary glands kick into overdrive as a reflex, producing extra spit to try to neutralize the acid. During a bad episode, your mouth can generate up to two teaspoons of saliva per minute. It feels like liquid pooling at the back of your throat, and the sour taste becomes hard to ignore. Water brash is more common when you’re lying down or bending forward.
What Makes It Worse
Body position plays a big role in how intense heartburn feels. Lying flat, bending over, or slouching after a meal lets gravity work against you, making it easier for acid to flow upward. Many people find that heartburn wakes them from sleep if they ate within two hours of going to bed. The sensation can feel more intense at night because lying down keeps acid in contact with the esophagus for longer stretches.
Tight clothing around your waist, overeating, and certain foods (citrus, tomatoes, spicy dishes, chocolate, coffee, alcohol) are common triggers. Eating smaller meals and staying upright for at least 45 minutes afterward typically reduces the severity. Propping the head of your bed up a few inches can help with nighttime episodes.
How Long an Episode Lasts
A typical heartburn episode lasts anywhere from a few minutes to a couple of hours. It usually responds well to over-the-counter antacids, which neutralize stomach acid and bring relief within minutes. If the trigger was a large meal, the discomfort may come in waves as your stomach continues digesting.
In some cases, heartburn can persist for a full day or even longer. A single prolonged episode doesn’t necessarily mean something is seriously wrong, but heartburn that occurs more than twice a week for several weeks may point to gastroesophageal reflux disease (GERD), a chronic form of acid reflux that can damage the esophagus over time.
Heartburn vs. Heart Attack
Heartburn and heart attacks can both cause chest discomfort, which is why people sometimes confuse them. The differences matter.
- Heartburn feels like burning, is tied to meals or body position, stays in the chest and throat area, and typically improves with antacids.
- A heart attack feels like pressure, tightness, or squeezing in the chest or arms. The pain may spread to the neck, jaw, or back. It often comes with shortness of breath, cold sweats, sudden dizziness, or unusual fatigue.
One important detail: both heartburn and a developing heart attack can produce symptoms that fade and return. Brief pain does not rule out a cardiac event. If chest discomfort comes with pressure that radiates, difficulty breathing, or a cold sweat, treat it as an emergency. Heart attacks sometimes also cause nausea and what feels like indigestion, which adds to the confusion.
Signs That Heartburn Needs Attention
Occasional heartburn after a big meal is normal. But certain patterns suggest something beyond routine acid reflux. Difficulty swallowing, the sensation that food is getting stuck in your chest, unexplained weight loss, or persistent vomiting alongside heartburn are all signals worth investigating. The same goes for heartburn that no longer responds to antacids or that keeps you up most nights despite lifestyle changes. These symptoms don’t always mean something serious, but they do warrant a closer look to rule out esophageal damage or other conditions.