Recurring indigestion most often comes down to one of three things: how your stomach and brain communicate, something irritating your stomach lining, or habits that put extra pressure on your digestive system. The most common diagnosis for people with chronic indigestion is functional dyspepsia, a condition where the gut and brain don’t coordinate properly. But infections, medications, and everyday triggers can all keep symptoms coming back.
Functional Dyspepsia: The Most Common Cause
If no obvious disease is found, the diagnosis is usually functional dyspepsia. This isn’t a structural problem you can see on a scan. It’s a breakdown in communication between your brain and your digestive tract, and it accounts for the majority of chronic indigestion cases.
Two things tend to go wrong. First, your stomach may become hypersensitive to normal stretching after a meal. People with this sensitivity feel pain or discomfort at levels of fullness that wouldn’t bother someone else. Second, your stomach may be slow to empty its contents into the small intestine. Research estimates that delayed stomach emptying occurs in roughly 40% of people with functional dyspepsia. When food sits in your stomach longer than it should, the result is that heavy, overly full feeling after eating, sometimes with nausea.
Because functional dyspepsia involves the nervous system, stress and anxiety can make it worse. Your gut has its own extensive network of nerves, and emotional states directly influence how those nerves fire. This is why indigestion often flares during stressful periods even when your diet hasn’t changed.
H. Pylori and Stomach Infections
A bacterial infection called H. pylori is one of the most overlooked causes of persistent indigestion, and it’s remarkably common. More than half the world’s population carries H. pylori at some point in their lives. The bacteria burrow into the protective lining of the stomach, causing irritation and inflammation (gastritis). Over time, they can damage that lining enough for stomach acid to create open sores called ulcers.
H. pylori can contribute to indigestion even without causing an ulcer. The chronic, low-grade inflammation alone is enough to produce ongoing discomfort. The infection is treatable with a course of antibiotics, but you have to know it’s there first. Many people carry it for years without being tested.
Other infections from bacteria like Salmonella, E. coli, and Campylobacter, or from parasites like Giardia, can also trigger indigestion, though these tend to cause more acute episodes rather than the persistent, recurring kind.
Medications That Irritate the Stomach
If your indigestion started around the same time as a new medication, that’s worth paying attention to. Several common drug classes are known to cause or worsen indigestion:
- NSAIDs like ibuprofen and naproxen, especially with regular use
- Iron supplements
- Certain antibiotics
- Corticosteroids
- Osteoporosis medications
- GLP-1 medications used for diabetes or weight loss
NSAIDs are the most frequent offender. They work by suppressing inflammation throughout the body, but they also reduce the protective mucus layer in your stomach. Taking them occasionally is different from taking them daily for weeks. If you rely on NSAIDs regularly for pain, the connection to your indigestion may be direct.
Food, Drink, and Eating Habits
Certain foods trigger indigestion through a specific mechanism: they relax the muscular valve at the top of your stomach (the esophageal sphincter) and slow digestion, letting food sit longer. High-fat foods are the biggest offenders, particularly fatty meats like bacon and sausage. Chocolate, carbonated drinks, and highly spiced or salty foods do the same thing. Caffeine and alcohol both relax that valve as well.
How you eat matters as much as what you eat. Large meals increase pressure inside the stomach, which pushes contents upward. Eating quickly means you swallow more air and give your stomach less time to signal fullness, so you’re more likely to overeat before you realize it. Eating late at night and then lying down removes gravity from the equation, making it easier for stomach contents to move in the wrong direction.
If your indigestion follows a pattern (worse after dinner, worse on weekends, worse during work lunches), tracking your meals for a week or two can reveal a trigger you hadn’t noticed.
How Age Shifts the Likely Cause
The most probable explanation for recurring indigestion changes as you get older. In children, H. pylori infection is the leading cause. In young adults, H. pylori and acid reflux (GERD) dominate. Between ages 40 and 60, ulcers become more common alongside those two. After 60, stomach and intestinal ulcers are the primary concern. This doesn’t mean other causes are impossible at any age, but it helps narrow down what’s most likely driving your symptoms.
How Recurring Indigestion Gets Diagnosed
Testing for recurring indigestion typically starts simple and gets more involved only if needed. Your doctor will likely begin by checking for H. pylori, since it’s common and treatable. There are three ways to test for it: a stool sample, a breath test where you swallow a labeled compound and breathe into a container, or a blood test. The breath and stool tests are the most accurate for active infection.
If H. pylori is ruled out and symptoms persist, the next step is usually an upper GI endoscopy. A flexible tube with a camera is passed through your mouth to visually inspect the lining of your esophagus, stomach, and the first part of your small intestine. During this procedure, small tissue samples can be taken to check for gastritis, ulcers, or (rarely) cancer. Imaging tests like CT scans or ultrasounds may also be used to look for structural problems.
When all of these tests come back normal, the diagnosis defaults to functional dyspepsia. That’s not a dismissal. It’s a recognized condition with its own treatment approaches, including medications that reduce stomach acid or help the stomach empty faster, and sometimes low-dose antidepressants that calm the gut’s nerve signals.
Over-the-Counter Relief and Its Limits
Antacids (calcium carbonate, aluminum-based products, sodium bicarbonate) neutralize stomach acid and can provide quick relief for occasional episodes. But federal labeling rules cap their use at two weeks without medical supervision. If you’re reaching for antacids daily, that’s a sign you need a diagnosis, not more antacids.
Acid-reducing medications like H2 blockers and proton pump inhibitors (PPIs) are available over the counter and work by reducing how much acid your stomach produces. They’re more effective than antacids for persistent symptoms, but they’re also meant as short-term solutions. Long-term use of PPIs in particular has been linked to reduced absorption of certain nutrients. These medications treat the symptom, not the cause, so they work best as a bridge while you figure out what’s actually going on.
Symptoms That Need Prompt Attention
Most indigestion is uncomfortable but not dangerous. Certain symptoms, however, signal something more serious. The American College of Gastroenterology flags these as reasons to seek evaluation promptly:
- Unintentional weight loss or loss of appetite
- Difficulty or pain when swallowing
- Vomiting blood or frequent vomiting
- Black, tarry stools (a sign of bleeding in the digestive tract)
- Indigestion with shortness of breath, sweating, or pain radiating to the jaw, neck, or arm (these can mimic or accompany a heart event)
- Symptoms lasting more than two weeks without improvement
That last point is worth emphasizing. Two weeks of daily indigestion is the threshold where testing becomes worthwhile, even if the symptoms feel minor. Catching an H. pylori infection or an early ulcer is straightforward, and treatment can resolve symptoms that might otherwise drag on for months.