Persistent stomach pain that keeps coming back usually points to one of a handful of common digestive conditions, a food intolerance, or the effects of stress on your gut. The tricky part is that dozens of conditions can cause recurring abdominal pain, and the location, timing, and type of pain all matter when narrowing down the cause. Roughly 1 in 7 people worldwide meets the clinical criteria for irritable bowel syndrome alone, so if your stomach hurts more often than it doesn’t, you’re far from unusual.
Upper Stomach Pain: Dyspepsia, Gastritis, and Ulcers
Pain that centers in the upper abdomen, between your ribs and belly button, often falls under a category called dyspepsia. You might feel burning, bloating, nausea after eating, or a heavy fullness that hits before you’ve finished a normal-sized meal. Sometimes the pain has nothing to do with meals at all, or it actually improves when you eat something.
Gastritis (inflammation of the stomach lining) and peptic ulcers can produce these same symptoms, but they have identifiable physical causes: a bacterial infection called H. pylori, long-term use of anti-inflammatory painkillers like ibuprofen, or excess stomach acid wearing through protective tissue. When testing doesn’t reveal any of these, the diagnosis is often functional dyspepsia, meaning the pain is real but no visible damage explains it. Functional dyspepsia is diagnosed based on symptoms alone, because routine imaging and bloodwork typically come back normal.
Acid reflux (GERD) is another common upper-abdomen culprit. The pain can feel like burning behind the breastbone or a dull ache in the upper stomach, often worse after meals or when lying down.
Lower Stomach Pain: IBS and Inflammatory Bowel Disease
Pain in the lower abdomen that comes with changes in your bowel habits is the hallmark of irritable bowel syndrome. Doctors define IBS as recurring abdominal pain at least one day per week for three months, combined with at least two of these patterns: the pain is tied to bowel movements, your stool frequency changes, or your stool consistency changes. Symptoms need to have been present for at least six months before a formal diagnosis.
IBS affects an estimated 14 to 20 percent of the global population depending on which diagnostic criteria are used. It doesn’t damage your intestines, but it can significantly disrupt daily life. Pain often eases after a bowel movement, and many people cycle between constipation and diarrhea.
Inflammatory bowel disease, which includes Crohn’s disease and ulcerative colitis, causes similar symptoms but involves actual inflammation and ulceration in the digestive tract. Unlike IBS, IBD tends to come with blood in the stool, unintentional weight loss, and fatigue. If your lower abdominal pain is persistent and accompanied by any of those, it’s worth investigating further.
Food Intolerances You May Not Recognize
One of the most overlooked reasons for daily stomach pain is a food intolerance. Unlike a food allergy, which triggers an immune response within minutes, food intolerances cause symptoms hours or even days after you eat the problem food. That delay makes them genuinely difficult to identify on your own.
The most common culprits are lactose (in dairy), gluten (in wheat, rye, and barley), and fructose (in fruit, honey, and some vegetables). A broader category called FODMAPs, a group of fermentable sugars found in foods ranging from onions and garlic to certain fruits and artificial sweeteners, triggers symptoms in many people with IBS. Food chemical sensitivities to sulfites, histamines, and glutamates (found naturally in aged cheeses, tomatoes, wine, and processed foods) can also cause recurring bloating, pain, diarrhea, and nausea.
Because symptoms can show up a full day or two after eating the trigger food, keeping a detailed food diary for two to three weeks is often more revealing than guessing.
How Stress Physically Hurts Your Gut
Stress doesn’t just make you feel anxious. It changes how your digestive system moves, contracts, and processes pain signals. The gut and brain communicate constantly through a network of nerves, and psychological stress, anxiety, or depression can speed up or slow down gut contractions, increase acid production, and heighten inflammation.
People with functional gut disorders like IBS or functional dyspepsia often perceive pain more intensely than others because their brains are more responsive to pain signals coming from the digestive tract. Stress amplifies this effect, making existing discomfort feel worse. This isn’t imaginary pain. It’s a measurable change in how your nervous system processes signals from your gut. For many people, managing stress through therapy, exercise, or relaxation techniques produces a noticeable reduction in stomach symptoms.
Less Obvious Causes Worth Knowing About
Several conditions cause chronic stomach pain but don’t immediately come to mind as digestive issues.
Small intestinal bacterial overgrowth (SIBO) happens when bacteria that normally live in the large intestine colonize the small intestine instead. This leads to bloating, pain, nausea, fullness after eating, diarrhea, and sometimes unintentional weight loss or malnutrition. SIBO is particularly common in people who’ve had abdominal surgery, take certain medications, or have conditions that slow gut motility.
Endometriosis affects roughly 1 in 10 women of reproductive age and frequently causes what feels like stomach pain. Tissue similar to the uterine lining grows outside the uterus, often involving the bowel and bladder. Symptoms include lower abdominal and back pain, pain with bowel movements, bloating, constipation, and nausea, particularly around menstrual periods. Because these symptoms overlap heavily with IBS, endometriosis is frequently misdiagnosed or dismissed for years.
Gallstones, hiatal hernias, ovarian cysts, and celiac disease round out the list of conditions that commonly cause persistent abdominal pain and are sometimes missed on initial evaluation.
What Testing Looks Like
If you’ve been dealing with stomach pain for weeks or months, a doctor will typically start with blood tests. A complete blood count checks for signs of infection or anemia. Electrolyte panels assess kidney and liver function. An albumin test can flag nutritional deficiencies that point toward malabsorption.
A stool sample can detect microscopic blood, signs of infection, or markers of food intolerance. For suspected acid-related conditions or ulcers, an upper endoscopy uses a thin flexible tube passed through the mouth to examine the stomach lining directly. A colonoscopy does the same for the large intestine and is particularly useful when IBD is suspected.
For harder-to-reach areas of the small intestine, a wireless capsule endoscopy (you swallow a pill-sized camera) can record acid levels, pressure, and how quickly your stomach empties. CT scans provide detailed images when blockages or structural abnormalities are suspected. Many of these tests are quick, outpatient procedures, and your doctor will choose which ones to pursue based on where your pain is, what it feels like, and what other symptoms accompany it.
Pain That Needs Immediate Attention
Most chronic stomach pain isn’t an emergency, but certain patterns require urgent care. Sudden, severe pain that doesn’t ease within 30 minutes is a red flag. So is abdominal pain paired with continuous vomiting, fever, a rapid pulse, or a swollen and tender abdomen.
Severe pain in the lower right abdomen with nausea, vomiting, and loss of appetite may signal appendicitis. Intense abdominal pain with vaginal bleeding can indicate an ectopic pregnancy. Pain in the middle upper abdomen that lasts for days, worsens after eating, and comes with fever and nausea points toward acute pancreatitis. Any of these combinations warrant a trip to the emergency room rather than a wait-and-see approach.