Your Free Guide to Understanding Abdominal Pain

Why Your Belly Hurts: The Most Common Causes

Abdominal pain affects roughly 10 percent of people at any given time, according to research from the American College of Gastroenterology. But not all belly pain feels the same, and not all belly pain comes from the same place. Understanding what's actually happening in your abdomen is the first step toward figuring out whether you're dealing with something minor or something worth talking to a doctor about.

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The abdomen contains dozens of organs and systems that can cause pain when something goes wrong. The most frequent culprits are straightforward: constipation, gas, indigestion, and stomach viruses. These conditions account for the majority of abdominal complaints people experience. Constipation alone affects about 16 percent of the general population, making it one of the most common digestive issues you might encounter.

Other common sources of abdominal pain include lactose intolerance, which affects roughly 65 percent of the global population after childhood; food sensitivities; urinary tract infections; and menstrual cramping in people who menstruate. Stress and anxiety also play a role—the gut-brain connection means that emotional tension can trigger real, physical pain in your stomach and intestines.

Less frequently, abdominal pain signals something more serious like appendicitis, gallstones, kidney stones, or inflammatory bowel disease. The difference typically comes down to how the pain behaves: where it's located, how long it lasts, what makes it better or worse, and what other symptoms appear alongside it.

• Constipation and gas: bloating, straining, irregular bowel movements
• Stomach virus: nausea, vomiting, diarrhea, often comes on suddenly
• Food intolerance: cramping and digestive upset 30 minutes to 2 hours after eating trigger foods
• Urinary tract infection: pain during urination, urgency, lower abdominal or back pain
• Menstrual cramping: cyclical pain in lower abdomen, typically mid-cycle or during period

Practical takeaway: Write down when your pain started, where exactly it hurts, what it feels like (sharp, dull, crampy), what makes it worse or better, and any other symptoms. This information will be valuable if you need to discuss it with a healthcare provider.

Location Matters: Where the Pain Is Tells You Something

Your abdomen is divided into regions, and where you feel pain can point toward which organ or system is involved. Doctors and nurses use this geographic breakdown as one tool to narrow down what might be happening.

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Pain in the upper right abdomen often relates to the gallbladder, liver, or right kidney. Gallstones affect about 10-15 percent of Americans, and the pain typically comes after eating fatty foods. It can range from mild to severe and may last anywhere from 30 minutes to several hours. Similarly, liver inflammation or hepatitis causes upper right pain, though usually with additional symptoms like jaundice (yellowing of the skin and eyes).

Upper left pain might involve the stomach, spleen, or left kidney. Stomach ulcers and gastritis (stomach lining inflammation) create burning sensations in the upper abdomen, sometimes radiating to the back. These conditions affect around 3-6 million Americans annually. Spleen problems are less common but can cause sharp pain under the left rib cage, especially after injury or certain infections.

Central abdominal pain—around the belly button and extending downward—typically involves the small intestine or lower digestive tract. Viral gastroenteritis commonly causes this type of pain, along with nausea and changes in bowel movements. Appendicitis also creates pain that often starts near the belly button before shifting to the lower right side.

Lower left pain frequently connects to diverticulitis (inflammation of small pouches in the colon), the lower left kidney, or gynecological issues in people with female reproductive organs. Lower right pain suggests appendicitis, ectopic pregnancy in pregnant people, or Crohn's disease affecting the lower intestine. Right-sided lower pain is also common with ovarian cysts or pelvic inflammatory disease.

Pain that wraps around your side or back—particularly in the upper abdomen—may signal kidney stones. Kidney stone pain is typically sudden and can be severe. Roughly 1 in 11 Americans will experience a kidney stone at some point in their lives.

• Upper right: gallbladder, liver, right kidney
• Upper left: stomach, spleen, left kidney
• Upper center: stomach, pancreas, esophagus
• Lower right: appendix, right ovary (if applicable), right ureter
• Lower left: left ovary (if applicable), left ureter, sigmoid colon
• Lower center: bladder, small intestine, reproductive organs
• Around the sides/back: kidneys, pancreas

Practical takeaway: Draw a simple diagram of your abdomen and mark exactly where the pain is located. Note whether it's on the surface or feels deeper inside. This visual record will help you describe it clearly to a healthcare provider if needed.

What Type of Pain Are You Actually Feeling?

The quality and character of pain provide critical clues. Medical professionals typically categorize abdominal pain into several distinct types, each suggesting different underlying causes.

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Sharp, stabbing pain feels like a knife wound and usually indicates something acute (sudden). This type of pain often corresponds with appendicitis, ruptured organs, perforated ulcers, or kidney stones. When sharp pain comes on suddenly and severely, it warrants medical attention. For example, a perforated peptic ulcer—where a hole develops in the stomach or duodenum—causes sudden, severe, knife-like pain that's hard to miss. About 10 percent of people with peptic ulcers develop perforations.

Dull, aching pain develops gradually and typically suggests chronic (long-term) conditions. Irritable bowel syndrome (IBS), which affects 10-15 percent of the global population, commonly produces dull, persistent cramping. Inflammatory bowel disease, including Crohn's disease and ulcerative colitis, also causes dull, gnawing pain alongside other digestive symptoms. Kidney infections create a dull but persistent ache in the lower back and sides.

Crampy, colicky pain comes in waves and often relates to the intestines trying to move things through (peristalsis). Gas, constipation, and early-stage diarrhea produce this wave-like cramping. Irritable bowel syndrome frequently presents as crampy pain that varies in intensity. This type of pain often improves with bowel movements or gas passing.

Burning pain typically points to inflammation or irritation of the stomach lining or esophagus. Acid reflux and GERD (gastroesophageal reflux disease) cause burning sensations in the upper abdomen and chest. About 20 percent of Americans experience acid reflux symptoms weekly. Peptic ulcers also create a burning sensation, though usually in the upper abdomen or between the ribs.

Pressure or fullness describes a sensation of heaviness or expansion in the abdomen. This often accompanies bloating from gas, constipation, or after eating large meals. Rarely, it can signal more serious conditions like bowel obstruction or ascites (fluid buildup in the abdomen).

Colicky pain—sharp, sudden, and intense in waves—often relates to objects or substances trying to pass through narrow ducts. Kidney stones and gallstones classically produce colicky pain. People describe kidney stone pain as some of the worst pain they've ever experienced; it can fluctuate between intense and merely severe, following the movement of the stone.

• Sharp/stabbing: appendicitis, perforated ulcers, kidney stones—seek medical attention if severe
• Dull/aching: chronic conditions like IBS, kidney infections, inflammatory bowel disease
• Crampy/colicky: gas, constipation, early diarrhea,