Heartburn is a burning sensation in the center of your chest, directly behind your breastbone. It can range from a mild warm discomfort to an intense, fiery pain that radiates upward toward your throat. Episodes typically last two hours or longer, though mild cases tied to a specific meal often fade once digestion is complete.
What the Burning Actually Feels Like
The signature sensation is a burning that starts in your upper abdomen and climbs into the middle of your chest. Some people describe it as a hot, stinging pressure rather than a sharp pain. The burn often intensifies after eating, especially if you lie down or bend over soon after a meal. It can also wake you from sleep, particularly if you ate within a couple of hours of going to bed.
Along with the chest burning, you may notice a sour or acidic taste in your mouth. This happens when small amounts of stomach contents travel back up through your esophagus and reach your throat. The taste can be unpleasant enough on its own, but it also signals that acid is irritating tissue that isn’t designed to handle it.
Why It Happens
At the bottom of your esophagus, a ring of muscle acts like a one-way gate: it opens to let food drop into your stomach, then closes to keep acidic digestive juices from flowing back up. Heartburn occurs when that muscular gate weakens or relaxes at the wrong time, allowing stomach acid to wash into the esophagus. The esophageal lining is far more sensitive than the stomach lining, so even brief contact with acid causes that characteristic burn.
Several things make this more likely. Alcohol can loosen that muscular gate and irritate the esophageal lining at the same time. Citrus fruits, tomato products, and spicy foods can directly irritate the lining even if the gate is functioning normally. Your body also relies on saliva to neutralize small amounts of acid that sneak through, so anything that reduces saliva production (certain medications, dehydration) can tip the balance.
Why Lying Down Makes It Worse
When you’re upright, gravity helps keep stomach contents down where they belong. The moment you lie flat, that advantage disappears, and acid can pool against the lower esophageal gate more easily. This is why heartburn often flares at night or when you bend forward to pick something up.
Propping your head up with extra pillows seems logical but can actually backfire. Bending at the waist increases pressure on your stomach and pushes contents upward. Elevating the entire head of your bed by about six inches, so your torso is on a gentle incline, is more effective. Tight clothing around the waist creates the same kind of upward pressure and can trigger or worsen symptoms.
How Long an Episode Lasts
A typical bout of heartburn lasts at least two hours, though it varies with the trigger. If a spicy meal caused it, the burning usually fades as your stomach finishes digesting that food. But symptoms can return hours later if you change position, bending over or lying down after you thought the episode had passed.
Over-the-counter antacids work by directly neutralizing stomach acid, so they bring the fastest relief. H2 blockers, another common option, take about an hour to start working but suppress acid production for a longer stretch. If you know a triggering meal is coming, taking an H2 blocker 30 to 60 minutes beforehand gives it time to kick in. Proton pump inhibitors (PPIs) are the slowest to start, needing one to four days for full effect, but they provide the longest-lasting acid reduction.
Heartburn vs. Heart Attack
Heartburn and heart attack chest pain can feel remarkably similar. Even experienced doctors sometimes can’t distinguish them based on symptoms alone. That said, there are patterns worth knowing.
Heartburn typically burns rather than squeezes, shows up after eating or when lying down, and improves with antacids. A heart attack more often feels like pressure, tightness, or a squeezing ache in the chest that may spread to the neck, jaw, arms, or back. Heart attacks frequently come with shortness of breath, cold sweat, lightheadedness, or sudden fatigue. Women are more likely than men to experience jaw or back pain, nausea, and shortness of breath rather than classic crushing chest pain.
If your chest discomfort is new, unusually severe, accompanied by shortness of breath or sweating, or doesn’t respond to antacids, treat it as a potential cardiac event.
Symptoms That Signal Something More Serious
Occasional heartburn after a rich meal is extremely common and usually harmless. But certain symptoms alongside the burning point to something that needs medical attention. Difficulty swallowing, a sensation that food is getting stuck in your chest or throat, unintended weight loss, or persistent vomiting all warrant evaluation. If a blockage ever makes it hard to breathe, that’s an emergency. Heartburn that occurs more than twice a week for several weeks may indicate gastroesophageal reflux disease (GERD), a chronic condition where repeated acid exposure can damage the esophageal lining over time.