Abdominal pain has dozens of possible causes, ranging from a mild stomach bug to conditions that need urgent treatment. The single most useful clue to narrowing down the cause is where exactly you feel the pain. Your abdomen contains organs spread across distinct regions, and pain in each area points toward different problems. Combining location with other details, like when the pain started, how it feels, and what makes it worse, can help you and your doctor figure out what’s going on.
Where You Feel It Matters Most
Your abdomen is roughly divided into four quadrants plus a central zone around the belly button. Each area houses different organs, so pain that stays in one spot often signals a problem with a specific organ.
- Upper right (under the right ribcage): The liver, gallbladder, and part of the pancreas sit here. Pain in this area most commonly points to gallbladder problems.
- Upper left (under the left ribcage): This is where the stomach, spleen, and the main body of the pancreas are located. Gastritis, ulcers, and spleen issues tend to show up here.
- Lower right: Home to the appendix. In women, the right ovary and fallopian tube are also here.
- Lower left: Contains the sigmoid colon (the last stretch of large intestine before the rectum) and, in women, the left ovary and fallopian tube. Diverticulitis is the classic cause of pain in this spot.
- Around the belly button: Pain here usually involves the small intestine. Early appendicitis also commonly starts as a dull ache around the navel before migrating to the lower right.
Pain that’s hard to pin down to one spot, or that spreads across the whole abdomen, is more likely related to gas, bloating, a stomach virus, or a condition like irritable bowel syndrome.
Sudden Pain vs. Pain That Keeps Coming Back
Acute abdominal pain develops over hours to days and usually signals something happening right now: an infection, inflammation, or a blockage. Common acute causes include appendicitis, gallbladder inflammation, urinary tract infections, viral gastroenteritis (the stomach flu), and diverticulitis. These conditions tend to come with other symptoms like fever, nausea, vomiting, or changes in bowel habits that develop alongside the pain.
Chronic abdominal pain comes and goes over weeks, months, or even years. It’s often harder to diagnose because the cause isn’t always something visible on a scan. Conditions behind chronic pain include GERD (acid reflux), gallstones, gastritis, celiac disease, endometriosis, hernias, and irritable bowel syndrome. The pain may flare up in patterns, like after eating certain foods or during stressful periods, then fade on its own before returning.
Gallbladder Pain After Meals
If your pain hits the upper right side of your abdomen, especially after a large or fatty meal, gallbladder trouble is a likely suspect. Gallstones can temporarily block the ducts that drain bile, causing what’s called biliary colic. The pain comes on suddenly, builds to an intense peak, then gradually fades. An episode typically lasts anywhere from 20 minutes to a few hours. Many people describe it as sharp, cramping, or squeezing, and it can radiate to the right shoulder or back.
This type of pain is episodic. You might feel fine for days or weeks between attacks. But repeated episodes usually mean the gallstones aren’t going away on their own, and the pattern tends to continue or worsen.
Lower Right Pain and Appendicitis
Appendicitis is one of the most common surgical emergencies, and its pain follows a recognizable pattern. It typically begins as a vague ache around the belly button, then migrates to the lower right abdomen over several hours. As inflammation worsens, the pain intensifies and becomes sharper. Coughing, walking, or any jarring movement makes it worse.
The location can vary. During pregnancy, the appendix shifts higher, so the pain may feel like it’s coming from the upper abdomen. In young children, the pain is often harder to localize. If you’re experiencing steady, worsening pain that started near your navel and settled in the lower right, especially with nausea or low-grade fever, that combination warrants prompt medical evaluation.
Lower Left Pain and Diverticulitis
Pain concentrated in the lower left abdomen, particularly if you’re over 40, often points to diverticulitis. This happens when small pouches that form in the wall of the colon become inflamed or infected. The pain is usually sudden and intense, though it can also start mild and gradually worsen. Fever, nausea, tenderness when the area is touched, and sudden changes in bowel habits (either diarrhea or constipation) commonly accompany it.
Diverticulitis can range from mild (treatable at home with a temporary diet change and oral medication) to severe, with complications like abscess formation. CT scans detect it with greater than 95% sensitivity and can show how far the inflammation has spread.
Stomach Bugs and Food Poisoning
The most common cause of abdominal pain that affects the whole belly is gastroenteritis, an infection of the stomach and intestines. Viral gastroenteritis, caused by norovirus or rotavirus, is by far the most frequent type. It brings cramping, watery diarrhea, nausea, and sometimes vomiting and low-grade fever. Most cases resolve on their own within one to three days.
Bacterial food poisoning can look similar but tends to come on faster (sometimes within hours of eating contaminated food) and may cause more severe symptoms, including bloody diarrhea or high fever. The key distinction often comes down to timing and context: did several people who ate the same meal get sick? Did symptoms hit hard and fast? Bacterial cases sometimes need antibiotics, while viral ones don’t respond to them.
When Pain Has No Visible Cause
Sometimes abdominal pain persists for months without any clear structural problem showing up on tests. This is more common than most people realize. Irritable bowel syndrome (IBS) is diagnosed when you’ve had recurrent abdominal pain at least one day per week for three months, and the pain is connected to bowel movements, changes in how often you go, or changes in stool consistency. Symptoms must have started at least six months before diagnosis. IBS is a real condition with real symptoms, but it won’t show up on imaging or blood work because it involves how the gut functions rather than visible damage.
There’s also a less well-known condition called centrally mediated abdominal pain syndrome, where continuous or near-continuous abdominal pain occurs without any clear connection to eating, bowel movements, or menstrual cycles. This type of pain limits daily functioning and isn’t explained by any other diagnosis. It’s thought to involve how the brain processes pain signals from the gut, and treatment focuses on managing pain perception rather than targeting a specific organ.
Signs That Need Urgent Attention
Most abdominal pain resolves on its own or turns out to be something manageable. But certain features signal that something more serious may be happening. Seek prompt medical care if your abdominal pain comes with any of the following:
- A rigid or distended abdomen that feels hard or drum-tight to the touch
- Severe pain with guarding, where your muscles tense involuntarily when the area is pressed
- Signs of gastrointestinal bleeding, such as vomiting blood or dark, tarry stools
- Fever combined with intense pain
- Fainting or lightheadedness
- Vomiting that’s green or yellow (bilious), which can indicate a bowel obstruction
- Pain following abdominal trauma, such as a car accident or a fall
Pregnancy adds another layer. Severe abdominal pain with a positive pregnancy test could indicate an ectopic pregnancy, which is a medical emergency. People over 50 with sudden, severe abdominal pain also face higher risk for conditions like a ruptured abdominal aortic aneurysm, which requires immediate intervention.
What Happens at the Doctor’s Office
When you see a doctor for abdominal pain, expect questions about exactly where it hurts, when it started, what makes it better or worse, and whether you’ve noticed changes in appetite, bowel habits, or urination. A physical exam, including pressing on different areas of your abdomen, helps narrow the possibilities.
If imaging is needed, the type depends on the pain’s location. Ultrasound is the first choice for upper right pain because it’s excellent at spotting gallstones and gallbladder inflammation. For lower right or lower left pain, a CT scan is preferred because it’s highly accurate for appendicitis and diverticulitis. Use of routine CT for suspected appendicitis has dropped the rate of unnecessary surgeries from about 24% to just 3%. For women of reproductive age, a pelvic ultrasound is typically recommended when a gynecologic cause is suspected. Standard X-rays have limited value for most abdominal pain and are rarely the first test ordered.
For pregnant patients, ultrasound and MRI are the go-to imaging options because they avoid radiation. CT is reserved for cases where those aren’t available or don’t give a clear answer.