A stomach ulcer typically feels like a dull or burning pain in the upper abdomen, centered in the area between your belly button and breastbone. The pain tends to come and go over days or weeks rather than being constant, and it often responds temporarily to eating food or taking an antacid, only to return later. That cycle of relief and recurrence is one of the most recognizable features of an ulcer.
Where and How the Pain Feels
The sensation most people describe is a gnawing or burning ache deep in the stomach area, not sharp or stabbing but persistent enough to be distracting. It sits in the upper middle part of your abdomen, roughly where your ribs come together. Some people compare it to a hunger pang that doesn’t go away after eating, while others describe it as a slow burn that seems to radiate outward from one central point.
If an ulcer has become deeper or more advanced, the pain can radiate to your back. Pain that spreads to the back may indicate the ulcer has begun to penetrate through the stomach or intestinal wall, which is a more serious situation that needs prompt medical attention.
When the Pain Gets Worse
Timing is one of the things that makes ulcer pain distinctive. For many people, the pain is worse between meals and at night, particularly when the stomach is empty and acid has nothing to work on but the ulcer itself. Others notice the opposite: pain that flares after eating, especially with larger or heavier meals. The pattern often depends on where the ulcer is located. Ulcers in the small intestine (duodenal ulcers) are more commonly associated with empty-stomach pain, while ulcers on the stomach lining itself can act up after food arrives.
Spicy foods and stress don’t cause ulcers, but they can amplify the discomfort. Alcohol and acidic foods like citrus or tomatoes tend to have the same aggravating effect. Many people find that a glass of milk or a simple antacid brings relief within minutes, but that relief is temporary. Antacids neutralize stomach acid quickly and can ease symptoms for a few hours, but they don’t heal the underlying sore. Over time, they can also trigger a rebound effect where your body produces even more acid in response.
Symptoms Beyond the Pain
Pain is the hallmark symptom, but ulcers often bring a cluster of other digestive complaints. Bloating and a feeling of uncomfortable fullness, even after eating small amounts, are common. Frequent belching, nausea, and a general sense of indigestion round out the picture. Some people lose their appetite because they associate eating with discomfort, which can lead to unintended weight loss over time.
It’s also worth knowing that many ulcers produce no symptoms at all. In one study of over 400 ulcer patients, nearly 60% had no noticeable symptoms. These “silent” ulcers are sometimes discovered only when a complication develops or during a procedure done for another reason.
How Ulcer Pain Differs From Heartburn
Ulcer pain and heartburn overlap enough to be confusing, since both involve stomach acid and both cause a burning sensation. The key difference is location. Heartburn affects the esophagus and produces a burning feeling higher up, in the chest and throat. Ulcer pain sits lower, in the abdomen between the belly button and breastbone. Heartburn also tends to worsen when you lie down or bend over, while ulcer pain is more tied to whether your stomach is full or empty.
Both conditions can cause nausea and indigestion, which adds to the confusion. But if you’re feeling a deep, persistent ache in your mid-abdomen that follows a predictable pattern around meals, that profile fits an ulcer more than reflux.
What Causes the Pain in the First Place
An ulcer is an open sore on the lining of your stomach or the upper part of your small intestine. The pain happens because stomach acid makes direct contact with the raw, damaged tissue, much like pouring lemon juice on a cut. Two things cause the vast majority of ulcers: infection with a bacterium called H. pylori, and long-term use of common pain relievers like ibuprofen, naproxen, and aspirin. Historically, H. pylori was linked to about 95% of duodenal ulcers and 85% of stomach ulcers. More recent data suggests those numbers have dropped to roughly 60-75%, partly because H. pylori infection rates have declined in many countries.
This matters because the cause determines how the ulcer is treated. An H. pylori ulcer requires a course of antibiotics to clear the infection, while an NSAID-related ulcer requires stopping or changing the medication. Both types also benefit from acid-suppressing drugs that let the sore heal.
How Ulcers Are Diagnosed
If your symptoms suggest an ulcer, doctors typically start by testing for H. pylori. The simplest option is a breath test: you swallow a small capsule or liquid containing a tagged form of urea, and if H. pylori bacteria are present in your stomach, they convert the urea into carbon dioxide that shows up when you exhale into a collection container a few minutes later. Stool tests and blood tests can also detect the infection.
To confirm the ulcer visually, doctors use an upper endoscopy. A thin, flexible tube with a camera is passed through your mouth and into your stomach and upper intestine. This lets the doctor see the ulcer directly and take small tissue samples to check for H. pylori or rule out other conditions. In some cases, an upper GI series (where you drink a chalky barium liquid and then have X-rays taken) is used instead.
Warning Signs of a Serious Complication
Most ulcers are uncomfortable but manageable. A smaller number develop dangerous complications, and the symptoms of those are hard to miss. Vomiting blood, which can look bright red or resemble dark coffee grounds, signals that the ulcer is bleeding. Black, tarry stools are another sign of bleeding, because blood changes color as it moves through the digestive tract. Sudden, severe abdominal pain that doesn’t let up may mean the ulcer has perforated, creating a hole through the stomach or intestinal wall.
Feeling lightheaded, weak, or faint alongside any of these symptoms suggests significant blood loss. These situations require emergency care, not a wait-and-see approach.