The most common symptom of a peptic ulcer is a dull or burning pain in the stomach, typically felt between the breastbone and the navel. This pain often flares up between meals or at night when the stomach is empty, though for some people it gets worse after eating. Around 32.9 million people worldwide have peptic ulcer disease, and while many experience this classic burning sensation, others develop ulcers with no noticeable pain at all.
The Primary Symptoms
That burning or gnawing stomach pain is the hallmark, but it rarely shows up alone. Most people with an ulcer also notice some combination of these symptoms:
- Feeling full or bloated after eating smaller amounts than usual
- Heartburn or acid rising into the throat
- Frequent belching
- Nausea
The pain tends to come and go over days or weeks rather than being constant. It may ease temporarily after eating or taking an antacid, then return. Some people describe it as a hunger pang that won’t quit, while others feel a steady ache. The location is almost always in the upper abdomen, centered or slightly to the left.
One important detail: the timing of the pain can hint at whether the ulcer is in the stomach or in the duodenum (the first section of the small intestine, just past the stomach). Stomach ulcers tend to hurt during or shortly after meals. Duodenal ulcers more often cause pain on an empty stomach, typically two to five hours after eating or in the middle of the night.
Ulcers That Cause No Symptoms
Not everyone with an ulcer feels it. People who take anti-inflammatory pain relievers like ibuprofen or aspirin regularly are especially prone to developing ulcers that stay silent. Research confirms that the damage these medications cause to the stomach lining correlates very poorly with symptoms. You can have significant erosion visible on a scope and feel nothing unusual.
This matters because the first sign of a silent ulcer can be a serious complication like internal bleeding rather than the gradual buildup of pain most people expect. Older adults and people on long-term anti-inflammatory medications are at highest risk for this pattern.
Signs of Internal Bleeding
When an ulcer erodes into a blood vessel, bleeding can be slow and subtle or fast and dangerous. Slow bleeding often reveals itself through:
- Black, tarry stools with a distinctive, unusually foul smell (the dark color comes from blood being digested as it passes through the intestines)
- Increasing fatigue or weakness from gradual blood loss
- Lightheadedness
Faster bleeding produces more dramatic symptoms. Vomiting blood is the most obvious. The blood may appear bright red, or it may look dark brown and grainy, often compared to coffee grounds. That coffee-ground appearance means the blood has been partially digested by stomach acid before being vomited up.
Significant blood loss triggers the body’s shock response: rapid heartbeat, cold or clammy skin, pale or grayish color to the lips and fingernails, confusion, and fainting. This is a medical emergency.
Signs of a Perforated Ulcer
In rare cases, an ulcer eats all the way through the stomach or intestinal wall. This is called perforation, and it feels nothing like ordinary ulcer pain. The hallmark is sudden, severe abdominal pain that comes on without warning and quickly becomes unbearable. People often describe it as the worst pain they’ve ever felt.
The pain typically starts in the upper abdomen and can spread to the back or shoulder. The abdomen becomes rigid and swollen, and even light touch is painful. Other symptoms include nausea, vomiting, a racing heart, and feeling faint. A perforated ulcer requires emergency surgery.
How Ulcers Are Diagnosed
If your symptoms suggest an ulcer, the diagnostic process usually starts with testing for H. pylori, the bacterium responsible for most ulcers. This can be done through a breath test (you swallow a special capsule and breathe into a container, and the bacteria’s activity is measured in your exhaled breath), a stool sample, or a blood test.
The definitive way to confirm an ulcer is an upper endoscopy, where a doctor passes a thin, flexible tube with a camera down the throat to look directly at the stomach lining. During this procedure, they can take small tissue samples to check for H. pylori, rule out other conditions, and assess how deep the ulcer goes. A less invasive option is an upper GI series, which involves swallowing a chalky barium liquid that coats the digestive tract and makes ulcers visible on X-rays.
Not everyone with ulcer-like symptoms needs an endoscopy right away. For younger people without alarming symptoms like weight loss or bleeding, doctors often start with H. pylori testing and a trial of acid-reducing treatment. If symptoms persist or worsen, the scope becomes the next step.
What Causes the Symptoms
A peptic ulcer is an open sore in the lining of the stomach or duodenum. Stomach acid continuously irritates that exposed tissue, which is what produces the burning pain. When food enters the stomach, it can either buffer the acid (temporarily easing the pain) or stimulate more acid production (making it worse), which is why the relationship between eating and pain varies from person to person.
The two main causes are H. pylori infection and regular use of anti-inflammatory pain medications. H. pylori weakens the protective mucus layer of the stomach, letting acid reach the tissue underneath. Anti-inflammatory drugs reduce the stomach’s ability to produce that protective mucus in the first place. Smoking and heavy alcohol use don’t cause ulcers on their own, but they slow healing and increase the risk of complications. Stress, long blamed as a cause, can worsen symptoms but isn’t considered a primary driver of ulcer formation.
The bloating, belching, and early fullness that come with an ulcer result from disrupted digestion. An inflamed or damaged stomach lining doesn’t move food through as efficiently, leading to gas buildup and that uncomfortable “too full” sensation even after a small meal.