Persistent stomach pain almost always has an identifiable cause, and the most common ones are treatable. If your stomach hurts daily or nearly every day, the likely culprits fall into a short list: irritable bowel syndrome (IBS), acid reflux, food intolerances, chronic stress, or inflammation of the stomach lining. Less commonly, inflammatory bowel disease or an infection may be driving the pain.
The key to figuring out what’s behind your pain is paying attention to patterns: where exactly it hurts, what makes it worse, and what other symptoms come with it.
IBS: The Most Common Cause of Chronic Gut Pain
Irritable bowel syndrome is the single most frequent diagnosis behind ongoing stomach pain. To qualify as IBS, the pattern needs to fit a specific profile: abdominal pain at least one day per week for three months, with symptom onset going back at least six months. The pain also needs to be connected to bowel habits, meaning it gets better or worse with bowel movements, or it showed up alongside a change in how often you go or what your stool looks like.
IBS doesn’t damage your intestines, but the pain is real. It’s driven by a process called visceral hypersensitivity, where the nerves lining your digestive tract become overly reactive. Your gut has its own nervous system, sometimes called the “second brain,” with nerve endings in every layer of the digestive organs. These nerves respond to food moving through, bacteria, stretching, and chemical signals. In people with visceral hypersensitivity, those nerves misinterpret normal digestion as painful. Gas that most people wouldn’t notice feels like cramping. Ordinary stretching of the intestinal wall registers as sharp discomfort.
This nerve oversensitivity often develops after a triggering event: a bad stomach infection, a period of severe stress, or a bout of inflammation. After the original problem resolves, the nerves stay on high alert, continuing to send pain signals to the brain even though nothing is wrong structurally.
Acid Reflux and Functional Dyspepsia
If your pain sits higher up, in the area between your belly button and your breastbone, acid reflux or functional dyspepsia may be the cause. Reflux produces a burning sensation that rises from the lower tip of the breastbone toward the throat, often with a sour taste from stomach contents moving back up into your esophagus. Some people also experience chest pain or pain while swallowing.
Functional dyspepsia is essentially chronic indigestion with no visible damage to explain it. You feel full too quickly, or your upper stomach burns and aches after meals. Like IBS, it’s classified as a “functional” disorder, meaning the problem is in how the digestive system behaves rather than in any structural abnormality. The two conditions frequently overlap: many people with IBS also have dyspepsia symptoms.
How Stress Physically Hurts Your Gut
Stress isn’t just “in your head” when it comes to stomach pain. Chronic psychological stress directly alters how your gut functions through measurable biological pathways. When you’re under sustained stress, your body ramps up activity in the systems that control your fight-or-flight response. This changes the levels of chemical messengers, including serotonin (most of which is actually produced in the gut, not the brain), in the walls of your colon. Animal research shows that chronic stress slows gut transit time, meaning food moves through more sluggishly, and increases signaling chemicals in the colon that amplify pain perception.
Stress also promotes immune activation in the gut lining, which can make the nerves there even more sensitive. This creates a feedback loop: stress increases gut sensitivity, the resulting pain causes more stress, and the cycle reinforces itself. If your stomach pain gets noticeably worse during high-pressure periods at work, after poor sleep, or during emotional difficulty, this connection is likely playing a significant role.
Food Intolerances You Might Not Realize You Have
Certain carbohydrates called FODMAPs (found in foods like onions, garlic, wheat, beans, apples, and dairy) are poorly absorbed by some people and ferment rapidly in the gut, producing gas, bloating, and pain. A structured elimination diet that temporarily removes these foods, then reintroduces them one category at a time, reduces symptoms in up to 86% of people with IBS, according to Johns Hopkins Medicine. That’s a striking success rate and a strong clue that food triggers are a major piece of the puzzle for many people.
Lactose intolerance and gluten sensitivity are also worth considering. About 10% of adults worldwide believe they’re sensitive to gluten or wheat, though controlled testing suggests that only 16 to 30% of those individuals have symptoms genuinely triggered by gluten specifically. That still leaves real cases, but it also means some people avoiding gluten might benefit more from investigating FODMAPs broadly rather than focusing on gluten alone.
Gastritis and H. pylori Infection
Chronic inflammation of the stomach lining, called gastritis, can cause a gnawing or burning pain in the upper abdomen, along with nausea, bloating, and a feeling of fullness. One of the most common causes is a bacterial infection with H. pylori, which lives in the stomach lining and triggers ongoing low-grade inflammation. Many people carry this bacterium without symptoms, but when it does cause problems, it produces epigastric pain (right below the ribs in the center), nausea, gas, and sometimes a loss of appetite or unintended weight loss.
H. pylori is easily tested for with a breath test, stool test, or blood test, and treatment with a course of antibiotics typically clears the infection. If your pain is concentrated in the upper middle abdomen and feels more like burning than cramping, this is worth investigating.
Warning Signs That Need Prompt Attention
Most chronic stomach pain comes from the conditions above, and none of them are dangerous in the short term. But certain symptoms suggest something more serious is happening. Inflammatory bowel disease (Crohn’s disease or ulcerative colitis) causes abdominal pain paired with persistent diarrhea, blood in your stool, unintended weight loss, fatigue, fever, or night sweats. These symptoms don’t come and go with meals or stress the way IBS does. They tend to escalate over time.
You should seek urgent evaluation if you experience severe pain that doesn’t respond to over-the-counter pain relief, a significant change in the location or intensity of pain you’ve had for a while, vomiting (especially if it’s new for you or the vomit is greenish-yellow), or any rectal bleeding. These patterns suggest a new or worsening process that needs imaging or other testing to rule out problems like obstruction, ulcers, or inflammatory disease.
Tracking Your Pain to Find the Cause
Because so many conditions cause overlapping symptoms, keeping a simple log for two weeks can dramatically speed up getting a diagnosis. Track three things: what you ate in the hours before the pain, where exactly the pain sits and what it feels like (burning, cramping, dull ache), and what was happening in your life that day in terms of stress, sleep, and activity. Note whether the pain relates to bowel movements: does it ease after you go, or get worse?
This kind of record helps separate IBS (pain linked to bowel changes, often in the lower abdomen) from dyspepsia or reflux (upper abdomen, linked to meals) from stress-driven pain (tracks with life circumstances more than food). It also gives a doctor something concrete to work with rather than the vague “my stomach always hurts” that makes diagnosis harder than it needs to be.
For many people, the answer turns out to be a combination of factors: a food sensitivity amplified by stress, layered on top of nerves that have been primed to overreact. Addressing even one piece of that puzzle, whether through dietary changes, stress management, or targeted treatment for an infection, often brings meaningful relief.