Stomach pain can mean dozens of different things, from something as simple as trapped gas to something that needs immediate medical attention. The single most useful clue is where it hurts. Your abdomen contains over a dozen organs packed into four general quadrants, and pain in each area points to a different short list of causes. Understanding the location, timing, and character of your pain can help you figure out what’s going on and whether you need to act quickly.
Where It Hurts Matters Most
Think of your abdomen as divided into four sections by two imaginary lines crossing at your belly button. Each quadrant houses different organs, so pain in each zone has a different meaning.
- Upper right: liver, gallbladder, and the head of the pancreas
- Upper left: stomach, spleen, and the tail of the pancreas
- Lower right: appendix, ascending colon, and (in women) the right ovary and fallopian tube
- Lower left: descending and sigmoid colon, and (in women) the left ovary and fallopian tube
Pain right in the center, just below the breastbone, often involves the stomach itself or the upper part of the small intestine. Pain that’s hard to pinpoint and seems to be “everywhere” is more typical of gas, bloating, or a stomach virus.
Upper Abdominal Pain
A dull or burning pain in the upper middle part of your abdomen is one of the most common complaints, and it usually comes down to a few culprits: acid reflux, gastritis (inflammation of the stomach lining), or a peptic ulcer. With ulcers, the pain often worsens between meals or at night when your stomach is empty, though some people feel it more after eating. Acid reflux tends to produce a burning sensation that rises toward the chest, especially after large meals or when lying down.
Pain in the upper right side that comes on suddenly and intensifies quickly often points to gallstones. Gallbladder pain typically hits after eating, because your gallbladder squeezes to release bile when food arrives in the small intestine. If a stone blocks the duct, the result is a sharp, intense pain that can radiate to your back between the shoulder blades or into your right shoulder. Episodes last anywhere from a few minutes to several hours.
Lower Abdominal Pain
Sharp pain in the lower right abdomen is the classic signal for appendicitis, but it doesn’t always start there. In a typical case, the pain begins around the belly button as a vague ache that comes and goes. Over several hours, nausea and vomiting develop, and then the pain migrates to the lower right side, becoming more focused and steadily worse. The spot where pain concentrates, called McBurney’s point, sits about two inches along an imaginary line drawn from the bony point of your hip to your belly button.
Lower left abdominal pain, particularly in adults over 50, often suggests diverticulitis. Small pouches that form in the colon wall become increasingly common with age, and when one gets inflamed or infected, the result is sudden, intense pain on the lower left side. Fever, nausea, and a change in bowel habits (sudden diarrhea or constipation) usually accompany it. The pain can also start mild and build over a day or two rather than hitting all at once.
Pain That Comes and Goes Over Weeks
If your stomach pain is a recurring problem rather than a one-time event, irritable bowel syndrome (IBS) is one of the most common explanations. The current diagnostic standard requires abdominal pain at least one day per week for three months, with symptoms that started at least six months earlier. The key feature is that the pain is tied to bowel movements: it gets better or worse when you go, and it comes with changes in how often you go or what your stool looks like.
IBS pain can show up anywhere in the abdomen and often shifts locations. It’s not dangerous, but it can significantly disrupt daily life. Stress, certain foods (dairy, high-fat meals, artificial sweeteners), and hormonal shifts around menstruation are common triggers.
Stomach Pain With a Gynecological Cause
In women, lower abdominal pain has an extra layer of possibilities. Ovarian cysts, ectopic pregnancy, and pelvic inflammatory disease (PID) can all feel like a stomach problem. PID tends to cause pain on both sides of the lower abdomen, is generally less intense than appendicitis, and can last for weeks. It often comes with vaginal discharge and painful urination. Appendicitis, by contrast, typically causes one-sided pain on the right that’s more intense and develops over 24 to 36 hours with nausea and loss of appetite.
An ectopic pregnancy, where a fertilized egg implants outside the uterus, can cause sudden severe pain on one side along with vaginal bleeding. This is a medical emergency. A pregnancy test is standard for any woman of childbearing age who shows up with acute abdominal pain, even if she’s using contraception.
When Stomach Pain Isn’t From Your Stomach
Sometimes abdominal pain has nothing to do with your digestive system. Heart attacks can cause what feels like stomach discomfort or nausea, particularly when a blockage affects arteries near the bottom of the heart. These arteries sit close to the diaphragm, and irritation there gets misinterpreted by your nervous system as belly pain. This happens because nerves from the heart and abdomen overlap in the spinal cord, a phenomenon called referred pain. The same nerve overlap explains why gallbladder problems cause shoulder pain and why kidney stones can make your groin ache.
Pneumonia in the lower lobes of the lungs, kidney infections, and kidney stones can all present as abdominal pain too. If your pain doesn’t match any typical digestive pattern, or if it comes with chest tightness, shortness of breath, or lightheadedness, the cause may be outside the abdomen entirely.
Signs You Need Emergency Care
Most stomach pain resolves on its own or with simple treatment. But certain features signal something serious:
- Rigid or distended abdomen: a belly that feels hard and board-like, or visibly swollen and tight
- Severe pain with guarding: you instinctively tense your muscles and can’t let anyone touch the area
- Signs of internal bleeding: vomiting blood, black or tarry stools, or feeling faint
- High fever with abdominal pain: suggests infection that may need urgent treatment
- Pain after abdominal trauma: a blow to the abdomen followed by worsening pain
- Fainting or near-fainting: can indicate significant blood loss or a cardiovascular event
People over 50 with new, severe abdominal pain get extra scrutiny because the risk of serious causes like a ruptured aneurysm or bowel obstruction increases with age. The same applies to anyone on blood thinners, since internal bleeding can develop with less obvious warning signs.
What Happens at the Doctor’s Office
If your pain brings you in for evaluation, expect a physical exam where the provider presses on different areas of your abdomen to pinpoint tenderness. Blood work typically checks for signs of infection, inflammation, and organ function. A urine test can flag kidney stones or a urinary tract infection.
Imaging depends on where the pain is. Ultrasound is the go-to for upper right pain (it’s excellent for spotting gallstones). CT scans with contrast are preferred for generalized pain, lower abdominal pain, and suspected appendicitis in non-pregnant patients. For pregnant patients, ultrasound and MRI are used instead to avoid radiation. In some clinics, a bedside ultrasound can quickly check for gallstones, kidney stones, or an inflamed appendix right in the exam room.
The combination of your pain’s location, its timing, what makes it better or worse, and these test results usually narrows things down to a clear diagnosis. Many causes of stomach pain, from gastritis to mild food poisoning, resolve with straightforward treatment or on their own. The key is recognizing the patterns that separate a bad day from a genuine emergency.