Heartburn is a burning sensation in the middle of your chest, starting behind your breastbone and often radiating upward into your throat. It can range from a mild warmth to a sharp, intense burn that makes you stop what you’re doing. Most episodes last two hours or longer, though mild heartburn after a spicy meal typically fades once your body finishes digesting.
The Core Sensation
The feeling starts in your esophagus, the tube connecting your mouth to your stomach. When stomach acid pushes back up into this tube, the lining gets irritated, and you feel it as a burning or stinging pain centered behind your breastbone. Some people describe it as heat spreading across the chest, while others feel a sharper, more localized ache. The pain can climb from your upper abdomen into your throat, especially when you’re lying flat or bending over.
Heartburn doesn’t usually feel like pressure or squeezing. It feels like something hot or acidic sitting in your chest. That distinction matters, and we’ll come back to it.
What Happens in Your Mouth and Throat
Heartburn isn’t always limited to your chest. Many people notice a sour or bitter taste at the back of their mouth when acid creeps high enough. This sometimes comes with a rush of extra saliva, a reflex your body uses to try to wash the acid back down. That combination of saliva and stomach acid can make it feel like liquid is stuck in the back of your throat.
In more noticeable episodes, partially digested food or stomach acid moves up into your throat. This regurgitation can leave a burning feeling in your throat and an unpleasant taste that lingers even after the chest pain fades. Some people also feel a tightness or rawness in the throat, almost like a mild sore throat that comes and goes.
When It Gets Worse
Heartburn is strongly tied to position and timing. The burning tends to flare after large or fatty meals, when your stomach is stretched and pushing against the valve at the top of it. Lying down within two hours of eating is one of the most reliable triggers, because gravity is no longer helping keep acid where it belongs. Bending over, whether to tie your shoes or pick something up, can have the same effect.
Symptoms that seemed to resolve can return hours later if you recline or bend at the wrong moment. Nighttime heartburn is especially common. Sleeping on your left side helps, because it positions the valve between your stomach and esophagus above the level of your stomach contents. Lying on your back or right side submerges that valve, making acid more likely to escape upward.
Eating smaller meals and finishing dinner several hours before bed both reduce the intensity and frequency of episodes.
Heartburn vs. Heart Attack Pain
This is the comparison most people worry about, and for good reason. The two can overlap in location. But they feel different in important ways.
- Heartburn feels like burning. It’s typically centered behind the breastbone, worsens after eating or lying down, and usually responds to antacids within minutes.
- Heart attack pain feels like pressure, tightness, or squeezing in the chest or arms. It can spread to the neck, jaw, or back. It’s often triggered or worsened by physical exertion and does not improve with antacids.
If you feel crushing chest pressure, pain spreading to your arm or jaw, shortness of breath, or sudden dizziness, treat it as a cardiac emergency. Heartburn doesn’t cause those symptoms.
Reflux Without the Burn
Some people have acid reflux that never produces the classic chest burning. This is called laryngopharyngeal reflux, or “silent reflux,” because the acid travels all the way up to the throat and voice box without triggering obvious heartburn symptoms. Instead, you might notice a persistent hoarseness, a feeling of something stuck in your throat, chronic throat clearing, a nagging cough, or excess mucus. Some people develop recurring sore throats or mild wheezing that gets misattributed to allergies or asthma.
Silent reflux is easy to miss precisely because it doesn’t feel like heartburn. If you have several of those throat symptoms without an obvious cause, acid reflux is worth considering.
When Heartburn Signals Something More
Occasional heartburn after a heavy meal is extremely common and not a cause for concern. But frequency matters. If you’re experiencing heartburn two or more times per week, or regularly reaching for over-the-counter antacids, that pattern fits the definition of gastroesophageal reflux disease (GERD). Chronic acid exposure can damage the lining of the esophagus over time, causing narrowing, erosions, or precancerous changes that are only visible on an endoscopy.
Certain symptoms alongside heartburn signal something that needs prompt attention: difficulty swallowing or a sensation of food getting stuck, unintended weight loss, persistent vomiting, or regurgitation that isn’t responding to standard treatment. Difficulty swallowing in particular can indicate that the esophagus has narrowed from repeated acid damage.