Heartburn is a burning sensation in the chest, felt directly behind the breastbone, caused by stomach acid flowing backward into the esophagus. It can range from mild discomfort to genuine pain, and episodes typically last two hours or longer depending on the trigger. If you’ve never experienced it before and are wondering whether that’s what you’re feeling, here’s what to expect.
The Core Sensation
The hallmark of heartburn is a burning feeling that starts in the upper abdomen or lower chest and rises upward behind the breastbone. Some people describe it as a hot, stinging pressure, while others feel it more like a raw ache. It’s not a sharp, stabbing pain. It builds gradually and tends to linger.
The burning happens because your stomach produces strong acid to digest food, and that acid is normally kept out of the esophagus by a ring of muscle at the bottom of the tube. When that ring relaxes at the wrong time or doesn’t close tightly enough, acid washes upward into tissue that isn’t designed to handle it. The esophagus has no protective lining against acid the way your stomach does, so even brief exposure causes irritation and that characteristic burn.
What Makes It Worse
Heartburn is strongly tied to body position. Lying down or bending over after eating can bring on an episode or intensify one that’s already started, because gravity is no longer helping keep acid in your stomach. Many people notice heartburn is worst at night when they go to bed, especially if they ate within a couple of hours of lying down.
Spicy food, acidic food, fatty meals, alcohol, and large portions are the most common dietary triggers. Mild heartburn caused by a specific meal typically fades once the food has been digested. But symptoms can return hours later if you bend over or lie flat, even after you thought the episode was over.
Beyond the Burn: Other Symptoms
Heartburn rarely shows up as just a chest sensation. Most people also notice at least one or two of these:
- Sour or bitter taste in the mouth. Acid that climbs high enough reaches the back of the throat, leaving an unmistakable acidic flavor.
- Excess saliva (water brash). Your salivary glands can flood your mouth with watery spit in response to acid in the esophagus. This is actually your body’s attempt to dilute the acid, but it creates a sensation of liquid pooling at the back of your throat.
- Bloating and belching. Gas buildup in the stomach often accompanies heartburn, especially after large meals. You may feel uncomfortably full with frequent burping.
- Nausea. Particularly with stronger episodes, the acid irritation can trigger mild to moderate nausea.
- Lump-in-the-throat feeling. Acid irritating the esophagus can make your throat feel tight or swollen, as if something is stuck there. This sensation, called globus, isn’t painful and doesn’t actually block swallowing, but it can be unsettling.
Some people also develop a dry cough or notice their voice sounds hoarse, particularly in the morning. These “silent” reflux symptoms happen when acid reaches the throat and vocal cords without causing obvious chest burning, so people don’t always connect them to heartburn.
How Long an Episode Lasts
A single heartburn episode typically lasts two hours or more. Mild episodes triggered by a specific food may resolve faster, especially if you stay upright and the meal moves through your digestive system. More intense episodes, or those worsened by lying down, can persist much longer.
Over-the-counter antacids usually bring relief within minutes to half an hour by neutralizing the acid already in the esophagus. If you’re getting heartburn a few times a week or more, that pattern suggests an underlying condition like gastroesophageal reflux disease (GERD), and the episodes will generally keep recurring until the root cause is addressed.
Heartburn vs. Heart Attack
This is the question behind many heartburn searches, and it matters. Both can cause chest discomfort, and they can genuinely be hard to tell apart. Here are the key differences:
Heartburn produces a burning sensation that tends to rise from the stomach area upward and is often tied to eating. It typically responds to antacids and worsens when you lie flat. A heart attack is more likely to feel like heavy pressure, squeezing, or tightness in the center of the chest. Heart attack pain often radiates to the jaw, neck, shoulders, or arms, particularly the left arm. It may come with shortness of breath, cold sweats, lightheadedness, or a sense that something is seriously wrong.
Heartburn does not cause pain that spreads to your arm or jaw. It does not make you break into a cold sweat. If you’re experiencing chest pressure with any of those additional symptoms, especially during physical activity or stress, treat it as a potential cardiac event and call emergency services. It’s always better to have heartburn evaluated and be wrong than to dismiss a heart attack.
Signs That Need Medical Attention
Occasional heartburn after a heavy meal is extremely common and not a cause for concern. But certain symptoms alongside heartburn point to something more serious. Difficulty swallowing, the feeling that food is getting stuck on the way down, unintended weight loss, or persistent vomiting all warrant a prompt medical evaluation. If a blockage ever makes it hard to breathe, that’s an emergency.
Heartburn that shows up more than twice a week, disrupts your sleep regularly, or no longer responds to over-the-counter remedies has likely crossed into GERD territory. Chronic acid exposure can damage the esophageal lining over time, so persistent symptoms are worth investigating rather than just managing with antacids indefinitely.