Heartburn is a burning pain in the chest, felt just behind the breastbone. It affects roughly 14% of adults worldwide on a weekly basis, making it one of the most common digestive complaints. While the sensation itself is hard to miss, heartburn can also show up in ways you might not expect, from a raspy voice in the morning to a cough that won’t quit.
The Core Sensation
The hallmark of heartburn is a burning feeling that starts behind the breastbone and can radiate upward toward your throat. It typically flares after eating, and bending over or lying down tends to make it worse. The burning is caused by stomach acid pushing up past the muscular valve at the top of your stomach and irritating the lining of your esophagus, which isn’t built to handle acid the way your stomach is.
Many people also notice a sour or bitter taste in the back of their mouth. This happens when a mixture of stomach acid and partially digested food travels far enough up the esophagus to reach the throat, a process called regurgitation. A related symptom, sometimes called water brash, occurs when acid rising in the esophagus triggers your salivary glands to produce a sudden flood of saliva. The result is an unpleasant, watery, sour-tasting mouthful that can catch you off guard.
How Body Position Changes Symptoms
Gravity plays a bigger role in heartburn than most people realize. When you’re upright, gravity helps keep stomach contents where they belong. Lie down after a meal and that advantage disappears, which is why nighttime heartburn is so common. Heartburn that wakes you from sleep is especially likely if you ate within two hours of going to bed.
A small study of 57 people with chronic heartburn found that sleeping position matters too. While the number of reflux episodes was similar regardless of position, acid cleared from the esophagus significantly faster when participants slept on their left side compared to their right side or back. Faster acid clearance means less tissue irritation and less pain. If nighttime symptoms are a regular problem for you, sleeping on your left side or elevating your upper body with a wedge pillow can make a noticeable difference.
Symptoms You Might Not Connect to Heartburn
Not all reflux symptoms happen in the chest or throat. When stomach acid reaches structures above the esophagus, it can trigger a set of problems that seem completely unrelated to digestion.
- Chronic cough: A dry, nonproductive cough that lasts longer than eight weeks and tends to occur during the day while you’re upright. Unlike a cold or allergy cough, it doesn’t come with congestion or sneezing.
- Hoarseness and throat clearing: Acid reaching the voice box causes chronic inflammation of the larynx. This can show up as a raspy voice, a persistent need to clear your throat, a sensation of something stuck in your throat, or voice fatigue after talking.
- Worsening asthma: People with asthma who notice their symptoms getting worse after meals, or who don’t respond well to standard asthma medications, may have reflux contributing to their breathing problems. Asthmatics tend to experience more frequent and more severe reflux symptoms, both day and night, compared to people without asthma.
These symptoms can exist alongside the classic burning sensation or entirely on their own. That second scenario is what makes them tricky to identify. If you have a lingering cough or hoarseness with no obvious cause, reflux is worth considering.
When Occasional Becomes Chronic
Everyone gets heartburn now and then, especially after a heavy meal or one too many cups of coffee. That’s normal. The American College of Gastroenterology draws the line at frequency: symptoms occurring two or more times per week, or evidence of damage to the esophagus, shifts the diagnosis from occasional heartburn to gastroesophageal reflux disease (GERD).
Over time, repeated acid exposure can cause changes to the esophageal lining. Signs that suggest this kind of damage include difficulty swallowing (food feeling like it gets stuck), painful swallowing, unexplained weight loss, a chronic sore throat, dark or tarry stools, and chest pain beyond the typical burning. These are signals that the esophagus may be narrowing from scar tissue or that the cells lining the esophagus are changing in response to chronic acid exposure.
Heartburn vs. Heart Attack
Heartburn and heart attacks can both cause chest pain, and the overlap is genuinely confusing. Heartburn pain is a burning sensation that usually follows a meal, gets worse when you lie down, and improves with antacids. It stays centered behind the breastbone and may come with that sour taste in the mouth.
Heart attack pain feels different. It’s more often described as pressure, tightness, or a squeezing ache in the chest or arms that can spread to the neck, jaw, or back. It may come with shortness of breath, cold sweat, sudden dizziness, or unusual fatigue. Women are more likely than men to experience jaw or back pain, nausea, and shortness of breath rather than the classic crushing chest pain. A heart attack can also mimic indigestion, which adds to the confusion.
If your chest pain is new, feels different from your usual heartburn, comes with any of those additional symptoms, or doesn’t respond to antacids, treat it as an emergency. The consequences of dismissing a heart attack as heartburn are far worse than getting checked out for what turns out to be reflux.