Heartburn is a burning pain in the chest, centered just behind the breastbone. It typically starts after eating and can last two hours or longer depending on the cause. Despite the name, it has nothing to do with your heart. The sensation comes from stomach acid flowing backward into the esophagus, the tube connecting your throat to your stomach.
Where You Feel It and What It Feels Like
The core sensation is a burning or hot discomfort that sits behind the breastbone, roughly in the center of your chest. It often starts in the upper abdomen and rises upward. Some people describe it as a warm pressure, others as a sharp sting. The intensity can range from a mild, nagging warmth to genuine pain that makes it hard to focus on anything else.
Along with the chest burning, you may notice a sour or bitter taste at the back of your throat. That taste is stomach acid that has traveled all the way up the esophagus. Some people also feel a sensation of food or liquid coming back up without full vomiting, which is called regurgitation. It can leave a hot, acidic feeling in the throat that lingers after the chest discomfort fades.
How Timing and Position Change the Feeling
Heartburn tends to flare after meals, especially large or fatty ones. But body position plays a major role in how intense it gets. When you’re standing or sitting, gravity helps keep stomach acid in place. When you lie down, that assistance disappears, and acid flows more easily into the esophagus. This is why heartburn often feels worse at night or when you recline after eating.
Bending over can produce a similar effect by compressing the stomach and pushing acid upward. Tight clothing around the waist does the same thing by increasing pressure on the abdomen. If you’ve noticed that the burning gets noticeably worse in certain positions, that pattern is a strong signal you’re dealing with acid reflux rather than something else.
Less Obvious Symptoms
Not everyone with acid reflux gets the classic chest burn. Some people experience what’s sometimes called “silent reflux,” where the acid reaches the throat and voice box without producing much heartburn at all. Instead, you might notice a persistent dry cough, a hoarse voice (especially in the morning), or a frequent need to clear your throat.
Another common sensation is globus, a feeling of a lump in your throat even though nothing is actually there. It isn’t painful, but it can be persistent and distracting. Globus differs from difficulty swallowing. If you’re having trouble getting food down, or it hurts to swallow, that’s a different issue worth investigating separately.
How Long a Typical Episode Lasts
A single episode of heartburn can last two hours or longer. Mild episodes triggered by a specific food might fade within 30 to 60 minutes, especially if you stay upright and let gravity do its job. More stubborn episodes, particularly those that start close to bedtime, can drag on through the night.
Occasional heartburn is common and not a sign of a serious problem. When it starts happening twice a week or more, or when it regularly disrupts sleep or daily activities, that crosses the threshold into gastroesophageal reflux disease (GERD), a chronic condition that benefits from a different management approach than the occasional antacid.
Heartburn vs. Heart Attack
The reason this distinction matters is that heartburn and a heart attack can both cause chest discomfort, and the overlap in location makes them easy to confuse. But the sensations are different in important ways.
Heartburn produces a burning quality, centered behind the breastbone, closely tied to eating or lying down. A heart attack typically feels like pressure, tightness, or a squeezing ache in the chest or arms. Heart attack pain often spreads to the neck, jaw, or back, and may come with shortness of breath, cold sweats, or lightheadedness. The textbook heart attack involves sudden, crushing chest pain, often brought on by physical exertion rather than a meal.
The key differences to keep in mind: heartburn burns, a heart attack squeezes. Heartburn stays mostly behind the breastbone and in the upper abdomen. Heart attack pain radiates outward to the arms, jaw, or back. Heartburn tends to worsen when you lie flat and improve when you sit up. Heart attack symptoms don’t respond to changes in position. If you’re experiencing chest pain and you’re not sure which one it is, especially if the sensation involves pressure, spreading pain, or difficulty breathing, treat it as a heart attack until proven otherwise.
What Makes Heartburn Worse
Certain foods are well-known triggers: citrus, tomatoes, chocolate, coffee, alcohol, spicy dishes, and high-fat meals. These either relax the valve between the esophagus and stomach or increase acid production, both of which make reflux more likely. Eating large portions amplifies the effect because a full stomach puts more pressure on that valve.
Beyond food, excess weight around the midsection increases abdominal pressure and pushes acid upward. Smoking weakens the esophageal valve over time. And simply eating within two to three hours of lying down is one of the most reliable ways to trigger a nighttime episode. Elevating the head of your bed by six to eight inches using blocks or a wedge under the mattress is more effective than stacking pillows, which can bend your body at the waist and actually increase stomach pressure.