Heartburn feels like a burning sensation in the middle of your chest, just behind the breastbone. It can range from a mild warmth to a sharp, searing pain that makes you stop what you’re doing. The sensation typically starts in your upper abdomen and rises toward your throat, and it often gets worse after eating, in the evening, or when you lie down or bend over.
The Core Sensation
The defining quality of heartburn is a burning pain behind the breastbone. Most people describe it as acid burning in the chest, like something hot is rising from your stomach upward. The intensity varies widely. Some episodes feel like a dull, warm discomfort you can mostly ignore. Others produce a sharp, intense burn that can wake you from sleep.
Heartburn can also show up as tightness or squeezing in the chest, which is one reason it gets confused with heart problems. But the telltale clue is that burning quality. If the sensation feels like heat rather than pressure, and it responds to antacids, you’re almost certainly dealing with heartburn.
Where the Pain Shows Up
The pain centers behind the breastbone, roughly in the middle of your chest. From there it commonly travels upward toward the throat. You might feel the burn at one fixed spot, or it might seem to creep from your upper abdomen to the base of your neck over the course of minutes. Some people feel it mostly in the throat rather than the chest, especially when lying flat.
Other Sensations That Come With It
Burning chest pain is rarely the only symptom. Most people also notice a sour or acidic taste in the mouth as stomach acid creeps upward. This is regurgitation: a mixture of stomach acid and partially digested food rising into the back of your throat. It can feel like liquid stuck at the base of your throat, and the taste is distinctly bitter or sour.
A related symptom called water brash takes this further. Your salivary glands kick into overdrive, producing excessive saliva that mixes with the rising acid. Some people generate up to two teaspoons of saliva per minute during an episode. The combination of excess saliva and acid creates that unpleasant, watery-sour sensation in your mouth that’s hard to swallow away.
Symptoms You Might Not Expect
Not everyone with acid reflux feels the classic chest burn. Stomach acid that reaches the throat and airways can cause a chronic dry cough, hoarseness, a sore or burning throat, and a persistent need to clear your throat. Some people develop a “globus sensation,” the feeling that something is stuck in your throat even when nothing is there. Reflux accounts for up to 60 percent of chronic laryngitis cases and roughly 25 to 50 percent of that stuck-in-the-throat feeling in people who see an ear, nose, and throat specialist.
If you’ve had a lingering cough or scratchy voice for weeks and no obvious cold or allergy to explain it, acid reflux is a real possibility, even if you’ve never felt the burning in your chest.
Why It Happens
Your esophagus (the tube connecting your mouth to your stomach) isn’t built to handle acid. Your stomach lining is; your esophagus is not. When stomach acid splashes upward past the valve at the top of your stomach, it irritates the esophageal lining and activates pain receptors. With repeated exposure, those nerve endings become increasingly sensitive. They start firing at lower levels of acid and even respond more strongly to physical pressure like swallowing food. This is why heartburn tends to get worse over time if the underlying reflux isn’t managed: the nerves essentially learn to overreact.
How Long an Episode Lasts
A typical heartburn episode can last two hours or longer. Mild episodes triggered by spicy or acidic food often fade once the food has been digested. More intense episodes, especially those happening at night when you’re lying flat, can linger longer because gravity isn’t helping keep acid in your stomach. Sitting upright or standing usually shortens the discomfort.
What Makes It Worse
Position matters more than most people realize. Lying down or bending over after eating lets acid flow more easily into the esophagus, which is why heartburn often flares in the evening or at night. Eating large meals, especially close to bedtime, is one of the most reliable triggers. The pain also tends to intensify after fatty, spicy, or acidic foods, and after drinking alcohol or coffee.
If you notice heartburn mostly when you lie down within two hours of eating, that timing alone tells you a lot about what’s causing it.
When It Becomes Something More
Occasional heartburn after a heavy meal is common. Roughly 18 to 28 percent of adults in North America experience reflux symptoms regularly. But when heartburn happens two or more times a week, or you’re reaching for over-the-counter antacids that often, it crosses the line into gastroesophageal reflux disease (GERD), a chronic condition that benefits from medical evaluation and longer-term treatment.
Heartburn vs. Heart Attack
This is the comparison most people searching this topic really want to understand, and it’s genuinely difficult. Even experienced doctors can’t always tell the difference from symptoms alone.
Heartburn typically burns, gets worse after eating or lying down, responds to antacids, and may come with a sour taste or regurgitation. A heart attack more often feels like pressure, tightness, or squeezing in the chest or arms that spreads to the neck, jaw, or back. Heart attacks also tend to bring shortness of breath, cold sweat, lightheadedness, or sudden fatigue. Women are more likely than men to experience jaw or back pain, nausea, or vomiting as heart attack symptoms rather than the classic crushing chest pain.
The overlap is real, though. Heartburn can cause squeezing sensations, and heart attacks can cause nausea that mimics indigestion. If you have chest pain with shortness of breath, cold sweat, or pain radiating to your arm or jaw, treat it as a cardiac emergency regardless of whether you think it might be heartburn.