GERD pain is felt most commonly behind the breastbone, in the center of the chest. It typically starts near the lower tip of the breastbone and rises upward toward the throat, producing the burning sensation known as heartburn. But acid reflux can also cause discomfort in the upper abdomen, throat, and even the mouth, which is why many people don’t immediately recognize it as reflux.
The Main Pain Zone: Behind the Breastbone
The signature location for GERD pain is retrosternal, meaning directly behind the breastbone. Most people describe it as a burning feeling that starts low in the chest and moves upward. This happens because stomach acid flows backward into the esophagus, which runs vertically from your stomach up through your chest. The acid irritates and inflames the tissue lining the esophagus, triggering pain receptors that become increasingly sensitive with repeated exposure.
The esophagus contains specialized receptors that respond to acid and heat. When refluxed acid hits these receptors, inflammatory chemicals like prostaglandins and histamine are released locally. These chemicals lower the threshold for pain, meaning that over time, even small amounts of reflux can trigger discomfort. Previously inactive nerve endings also get recruited into the process, which is why GERD pain often gets worse the longer you’ve had it.
Upper Abdomen and Epigastric Pain
Many people with GERD feel pain or discomfort in the upper abdomen, right below the breastbone, in the area sometimes called the pit of the stomach. This epigastric pain can feel more like pressure or general indigestion than the classic burning of heartburn. It often overlaps with the chest sensation, making it hard to pinpoint exactly where the discomfort starts and ends. Pain that worsens after eating is one of the strongest indicators that the source is gastrointestinal rather than cardiac. In diagnostic studies, the association between pain worsening with food intake and GERD was among the most reliable distinguishing features.
Throat and Neck Discomfort
When acid travels far enough up the esophagus, it can reach the throat and voice box. This produces a sore throat, hoarseness, or the persistent feeling of a lump stuck in your throat (a sensation called globus). Throat reflux happens most often at night, when lying flat makes it easier for acid to travel upward. Some people never experience classic heartburn at all and only notice throat symptoms, a pattern sometimes called silent reflux or laryngopharyngeal reflux.
The lump-in-the-throat sensation can come from two different mechanisms: acid directly irritating the throat lining, or acid in the lower esophagus triggering a nerve reflex that tightens the muscles at the top of the esophagus. Either way, it tends to come and go rather than staying constant, and it’s typically uncomfortable rather than sharply painful.
Mouth, Teeth, and Tongue
Chronic acid reflux can reach the mouth, causing burning mouth syndrome, where the tongue, palate, or inner cheeks feel raw or scalded. Over time, repeated acid exposure also erodes tooth enamel. The damage typically hits the inner surfaces of the upper front teeth first, since that’s where regurgitated acid makes the most contact. If reflux continues long enough, the chewing surfaces of the back teeth erode as well. People with GERD-related dental erosion often notice increased tooth sensitivity, especially to hot, cold, or sweet foods, long before visible damage appears.
How to Tell It Apart From Heart Pain
GERD chest pain and cardiac chest pain overlap in location, which is why this distinction matters. Both can produce discomfort behind the breastbone. Several features help separate them. GERD pain is more likely to be burning in quality, worsen after eating, and last less than an hour per episode. It also tends to radiate upward behind the breastbone rather than into the left arm or jaw. Cardiac pain, by contrast, is more likely to worsen with physical exertion, breathing, or movement.
GERD is the most common cause of non-cardiac chest pain. Studies have found that between 68% and 90% of people evaluated for unexplained chest pain have reflux-related symptoms, and 78% to 92% of those with confirmed GERD improved on acid-reducing treatment. GERD-related chest pain also tends to affect a slightly younger population with a higher proportion of women compared to cardiac chest pain. If localized muscle tension reproduces the pain when you press on the chest wall, that’s a sign it’s even less likely to be reflux or cardiac in origin.
Why Pain Gets Worse Lying Down
Gravity helps keep stomach acid where it belongs when you’re upright. Lying flat removes that advantage, allowing acid to pool in the esophagus longer and travel farther toward the throat. This is why many people notice that GERD pain peaks at bedtime or wakes them during the night.
Elevating the head of the bed by about 20 centimeters (roughly 8 inches) reduces the amount of time acid sits in the esophagus and improves clearance. You can do this with a wedge-shaped pillow angled at about 20 degrees, or by placing blocks or risers under the legs at the head of your bed frame. Simply stacking pillows tends to be less effective because it bends you at the waist rather than creating a gradual slope. Sleeping on your left side also helps, because the anatomy of the stomach means acid is less likely to escape when you’re positioned this way.
Pain Patterns That Point to GERD
GERD pain has a few characteristic patterns that help distinguish it from other conditions. It tends to flare after meals, particularly large or fatty ones. It worsens when you lie down or bend over. Individual episodes typically last less than an hour, though the overall condition is chronic, recurring over weeks or months. The pain often improves temporarily after taking an antacid or drinking water, since both dilute or neutralize the acid sitting in the esophagus.
If your chest or upper abdominal pain follows these patterns, especially if paired with a sour taste in the mouth, regurgitation, or throat irritation, GERD is a likely explanation. Pain that spreads to the back between the shoulder blades is less common but can happen with severe reflux. Pain that consistently worsens with exertion, radiates to the left arm, or comes with shortness of breath warrants a cardiac evaluation regardless of other symptoms.