Bad stomach pain has dozens of possible causes, ranging from something as simple as trapped gas to conditions that need emergency treatment. The location of your pain, when it started, and what makes it better or worse are the biggest clues to what’s going on. Pain that is sudden, severe, and doesn’t ease within 30 minutes warrants emergency medical care.
Where It Hurts Matters
Your abdomen contains many different organs packed into a relatively small space, and pain in one area often points to a specific problem. Thinking of your belly as four quadrants can help you narrow things down.
Upper right: This is where your gallbladder, liver, and part of your pancreas sit. Sharp pain here, especially after a fatty meal, often points to gallbladder trouble. An episode of biliary colic (gallbladder pain from a stone temporarily blocking the bile duct) typically lasts 20 minutes to a few hours and is triggered when fats in your food cause the gallbladder to squeeze.
Upper left or upper middle: Your stomach, spleen, and pancreas live here. Pain in the upper middle belly that worsens after eating and radiates to your back or shoulders is a hallmark of pancreatitis. This pain can start mild and escalate, or hit suddenly and intensely.
Lower right: The appendix sits here. Appendicitis pain often starts vaguely around the belly button and then migrates to the lower right side over several hours, accompanied by loss of appetite, nausea, or fever. The point of maximum tenderness is roughly halfway between your belly button and the bony point of your right hip.
Lower left or lower right: These quadrants also contain parts of your colon, your kidneys, ureters, and (in women) the ovaries and fallopian tubes. Pain here can signal anything from a kidney stone to an ovarian cyst to a flare of diverticulitis.
Common Causes That Resolve on Their Own
Most episodes of bad stomach pain are caused by something temporary. Viral gastroenteritis, often called the stomach flu, typically produces cramping, nausea, vomiting, and diarrhea within 24 to 72 hours of exposure to a virus. Most cases clear up in a few days, though some people feel unwell for 10 days or more.
Food poisoning symptoms can appear anywhere from a few hours to weeks after eating contaminated food, depending on the specific pathogen. The pain is usually crampy and centered around your belly button or lower abdomen, accompanied by diarrhea and sometimes vomiting. Most cases resolve without treatment within a few days.
Gas, constipation, and indigestion can also produce surprisingly intense pain. Trapped gas tends to cause sharp, stabbing sensations that shift around and improve after you pass gas or have a bowel movement. Constipation pain is often a dull, persistent pressure in the lower abdomen.
Kidney Stones
Kidney stone pain is notoriously severe, often described as one of the worst pains people have experienced. It starts in the flank (the side of your back below the ribs) and radiates downward. Where it radiates depends on where the stone is stuck: a stone in the upper urinary tract causes flank pain, while a stone lower down sends pain into the groin, testicle, or labia. The pain comes in intense waves, and you may also notice blood in your urine or a constant urge to urinate.
Gallbladder Attacks
If your pain hits after eating, particularly after a large or greasy meal, your gallbladder is a prime suspect. The pain is usually steady and intense in the upper right abdomen, sometimes radiating to the right shoulder blade. Episodes tend to repeat, and eating primarily low-fat foods can reduce the frequency of attacks by limiting how forcefully the gallbladder contracts.
Causes Specific to Women
Several conditions unique to women can cause severe lower abdominal or pelvic pain. Ovarian cysts can produce a sudden, sharp pain on one side if they rupture. Menstrual cramps and endometriosis cause recurring lower abdominal pain tied to the menstrual cycle. An enlarged uterus, whether from fibroids or pregnancy, can press against surrounding structures and create pain in either lower quadrant.
Ectopic pregnancy is a serious cause of lower abdominal pain in women of reproductive age. The first warning signs are often light vaginal bleeding and pelvic pain. If a growing embryo ruptures the fallopian tube, it causes heavy internal bleeding with symptoms like extreme lightheadedness, fainting, and shoulder pain. This is a medical emergency.
Bowel Obstruction
A bowel obstruction happens when something blocks your intestine so food and waste can’t pass through. Symptoms include severe cramping that comes and goes, bloating, a visibly swollen abdomen, vomiting, loud gurgling bowel sounds, inability to pass gas, and constipation. This combination of symptoms, especially if you’ve had previous abdominal surgery (a common risk factor for adhesions that cause blockages), needs emergency evaluation.
Signs You Need Emergency Care
Not all stomach pain requires a trip to the emergency room, but certain patterns signal something potentially dangerous:
- Sudden, severe pain that doesn’t ease within 30 minutes
- Pain with continuous vomiting that prevents you from keeping fluids down
- A rigid, board-like abdomen that is extremely tender to touch
- Fever with abdominal pain, particularly a high or rising temperature
- Signs of internal bleeding: extreme lightheadedness, fainting, rapid pulse, or bloody or black stools
- Pain with vaginal bleeding if you could be pregnant
Conditions like appendicitis, pancreatitis, ruptured ectopic pregnancy, and bowel obstruction can all become life-threatening if they aren’t treated promptly. Appendicitis pain that starts vague and moves to the lower right side, pancreatitis pain that bores through to the back, and obstruction symptoms with an inability to pass gas are all patterns worth taking seriously rather than waiting out.
What to Expect at the Doctor
When abdominal pain is severe or persistent enough to get checked out, a CT scan of the abdomen and pelvis with contrast dye is the most common imaging test. It can identify a wide range of problems, from appendicitis to kidney stones to abscesses. Ultrasound is used as the first choice for pregnant patients and is also good for evaluating the gallbladder. Plain X-rays have a limited role, though they can help spot a bowel obstruction or a swallowed foreign object.
Your doctor will also press on different areas of your abdomen to check for tenderness, guarding (when your muscles tighten involuntarily), and rebound pain (pain that worsens when pressure is released). These physical exam findings help distinguish surgical emergencies from conditions that can be managed more conservatively. Blood and urine tests round out the picture, checking for infection, inflammation, and organ function.