Stomach pain has dozens of possible causes, and the two biggest clues to narrowing it down are where it hurts and how long it’s been going on. In emergency department studies, the most common diagnoses are acute gastroenteritis (about 11% of cases) and nonspecific abdominal pain (about 10%), followed by gallstones, kidney stones, diverticulitis, and appendicitis. That means most stomach pain turns out to be something temporary and manageable, but a smaller percentage points to something that needs prompt attention.
Why Location Matters
Your abdomen holds a lot of organs packed into a relatively small space, and where you feel pain is one of the best indicators of what’s going on. Doctors mentally divide the belly into four quadrants using your belly button as the center point.
The upper right holds your gallbladder, the right portion of your liver, the first part of your small intestine, and the head of your pancreas. Pain here often points to gallbladder issues, especially if it flares after fatty meals. The upper left contains your spleen, the tail of your pancreas, part of your stomach, and your left kidney. Pain dead center at the top of your abdomen, just below your ribs, is called epigastric pain and is the classic location for acid reflux, stomach inflammation (gastritis), and ulcers.
The lower right is where your appendix sits, along with the end of your small intestine. Sharp pain that starts near your belly button and migrates to the lower right is the textbook pattern for appendicitis. The lower left houses most of your large intestine and is the typical spot for diverticulitis, a condition where small pouches in the colon wall become inflamed. In women, both lower quadrants also contain reproductive organs, so ovarian cysts, endometriosis, or ectopic pregnancy can all produce lower abdominal pain.
How the Pain Feels Gives You Clues Too
Not all abdominal pain works the same way. Pain coming from your internal organs, like your intestines or stomach lining, tends to feel dull, achy, and hard to pinpoint. You might wave your hand over a general area rather than pointing to one spot. This type of pain often comes with nausea or a crampy, squeezing quality. It’s frequently described as more unpleasant and unsettling than sharp pain, even when it’s less intense.
Sharp, well-localized pain that you can point to with one finger usually means the lining of your abdominal wall or the membrane surrounding your organs has become irritated. This is what happens when an inflamed appendix or a perforated ulcer starts affecting the tissue around it. This kind of pain typically gets worse when you move, cough, or press on the area.
Sometimes pain shows up in a location that seems unrelated to the actual problem. A gallbladder attack can radiate to your right shoulder blade. Kidney stones often send pain from your back around to your groin. A heart attack can present as upper abdominal discomfort rather than chest pain, particularly in women and older adults.
The Most Common Causes
Gastroenteritis, the combination of nausea, vomiting, diarrhea, and cramping caused by a viral or bacterial infection, tops the list. It usually comes on suddenly, lasts one to three days, and resolves on its own. If you recently ate something questionable or someone in your household is also sick, this is the most likely explanation.
Gas and bloating are probably the single most frequent cause of stomach discomfort that people don’t seek care for. Trapped gas can produce surprisingly sharp, intense pain that shifts location as it moves through your intestines. It typically comes in waves and improves after passing gas or having a bowel movement.
Constipation causes a dull, crampy fullness usually in the lower left abdomen. Acid reflux and gastritis produce burning or gnawing pain in the upper middle abdomen that often worsens on an empty stomach or after spicy, acidic, or fatty foods. Menstrual cramps cause lower abdominal pain that coincides predictably with your cycle.
Irritable bowel syndrome (IBS) is one of the most common causes of recurring stomach pain. It produces cramping, bloating, and changes in bowel habits, often triggered by stress, certain foods, or hormonal shifts. IBS pain typically improves after a bowel movement.
Causes That Aren’t Digestive
Your stomach area can hurt even when nothing is wrong with your stomach. Kidney stones produce severe, wave-like pain in your side or back that radiates toward your lower abdomen and groin. The pain tends to come in intense surges and is often accompanied by blood in the urine. Urinary tract infections can cause lower abdominal pressure and discomfort along with burning during urination.
Muscle strain from exercise, heavy lifting, or even aggressive coughing can mimic abdominal pain. The difference is that muscle pain tends to worsen with specific movements and feels tender when you press on the surface. Pneumonia in the lower lungs occasionally causes upper abdominal pain, and as noted earlier, heart problems can masquerade as stomach pain.
Acute Pain vs. Chronic Pain
Pain that comes on suddenly and has been present for hours to days is considered acute. This is the type that most often sends people to urgent care or the emergency room, and it’s where conditions like appendicitis, gallbladder attacks, and kidney stones fall.
Pain that persists for more than three months is classified as chronic. By that point, the more urgent causes have usually been ruled out, and the focus shifts to conditions like IBS, chronic gastritis, food intolerances, or what’s now called centrally mediated abdominal pain syndrome. This is persistent pain lasting six months or more without any identifiable structural problem. It doesn’t mean the pain isn’t real. It means the nervous system itself has become sensitized and is generating pain signals even without ongoing tissue damage. This type of chronic pain often responds better to approaches that target the nervous system, like certain medications that calm pain signaling, cognitive behavioral therapy, or stress management, rather than repeated testing for a physical cause.
Signs You Need Immediate Attention
Most stomach pain is not an emergency, but certain combinations of symptoms suggest something serious is happening. Severe pain that makes it hard to stand up straight or find a comfortable position warrants urgent evaluation. A rigid or distended abdomen that feels hard to the touch is a red flag. Vomiting blood or material that looks like coffee grounds, or passing black, tarry stools, signals bleeding somewhere in your digestive tract.
Fever combined with worsening abdominal pain suggests infection or inflammation that may need treatment. Fainting or feeling lightheaded alongside stomach pain can indicate internal bleeding or a serious vascular problem. Pain that started after abdominal trauma, even if it seemed minor at the time, deserves evaluation because internal injuries don’t always produce immediate symptoms.
For women of reproductive age, severe lower abdominal pain with a missed or late period raises concern for ectopic pregnancy, which requires emergency care. Sudden, intense pain in the groin or scrotum in men can indicate testicular torsion, which is also time-sensitive.
What to Expect at the Doctor
If your pain brings you to a doctor, expect questions about exactly where it hurts, when it started, what makes it better or worse, and whether you have associated symptoms like fever, vomiting, or changes in bowel habits. A physical exam will involve pressing on different areas of your abdomen to check for tenderness, guarding (involuntary muscle tightening), or masses.
Blood work and urine tests are common first steps. For imaging, a CT scan with contrast is the go-to for most types of acute abdominal pain because it provides the broadest view and highest accuracy across many possible diagnoses. Ultrasound is often the first choice for gallbladder-related pain, pregnancy-related concerns, or when radiation exposure needs to be minimized. In pregnant patients, ultrasound can provide most of the necessary diagnostic information without any radiation risk.
For chronic or recurring pain, the workup might expand to include stool tests, breath tests for food intolerances, or an endoscopy to look directly at the lining of your stomach and upper intestine. With over 150 possible diagnoses for abdominal pain documented in large emergency department studies, the process sometimes involves ruling things out systematically rather than landing on an answer immediately.