Pain on the right side of your abdomen can come from several different organs, and where exactly you feel it, along with how it started, helps narrow down the cause. The right side houses your liver, gallbladder, appendix, the first part of your large intestine, your right kidney, and in women, the right ovary and fallopian tube. Some causes are mild and resolve on their own, while others need urgent medical attention.
Upper Right Pain: Gallbladder and Liver
The most common reason for sharp or cramping pain in the upper right abdomen, just below your ribs, is a gallbladder problem. Gallstones can block the duct that drains the gallbladder, causing intense pain that often radiates to your right shoulder or between your shoulder blades. This pain frequently kicks in after eating, especially after a large or fatty meal. If the gallbladder becomes inflamed (a condition called cholecystitis), you’ll also notice tenderness when you press on the area, along with nausea, vomiting, and sometimes fever.
Gallbladder pain tends to build over minutes and can last anywhere from 30 minutes to several hours. If it resolves and comes back, that pattern of recurring episodes after meals is a strong clue. If the pain stays constant for more than a few hours and you develop a fever, that points toward active inflammation or infection rather than a simple gallstone attack.
Your liver sits in the same area and can also cause upper right pain, though it does so differently. The liver itself doesn’t have pain receptors, but the thin capsule surrounding it does. When the liver swells from conditions like hepatitis or fatty liver disease, that capsule stretches and triggers a dull, aching discomfort. This type of pain tends to be less sharp than gallbladder pain and more persistent. You might also notice it worsens when you lie on your left side, because gravity pulls the swollen liver and stretches the capsule further.
Lower Right Pain: Appendicitis
Pain in the lower right abdomen is the hallmark of appendicitis, and the way it moves is one of its most recognizable features. It typically starts as a vague ache around your belly button, then over the course of 12 to 24 hours migrates to the lower right side, where it becomes sharper and more localized. About 50 to 60% of people with appendicitis follow this classic migration pattern. Along with the pain, you may lose your appetite, feel nauseous, vomit once or twice, and develop a low-grade fever.
A useful self-check: if pressing on the lower right area and then quickly releasing causes a sharp spike of pain (called rebound tenderness), that’s a concerning sign. Pain that gets worse when you straighten your right leg or rotate your right hip inward also points toward an inflamed appendix. Appendicitis is most common in people between ages 10 and 30, but it can happen at any age. In older adults, the presentation is often less obvious, which makes it trickier to recognize.
Kidney Stones
A stone in the right kidney or ureter produces pain that often starts in your back or flank and wraps around toward your lower abdomen and groin. This pain is famously intense, comes in waves, and doesn’t improve with changing position. You may also notice blood in your urine (sometimes visible, sometimes only detectable on a test), frequent urination, or a burning sensation when you urinate. Kidney stone pain can overlap with appendicitis in location, but the wave-like pattern, back involvement, and urinary symptoms help distinguish it.
Digestive Conditions That Cause Right-Sided Pain
The last section of your small intestine, called the terminal ileum, sits in the lower right abdomen. This is the area most commonly affected by Crohn’s disease, an inflammatory bowel condition that causes chronic or recurring right lower quadrant pain alongside diarrhea, weight loss, and fatigue. Unlike appendicitis, Crohn’s pain develops gradually over weeks or months and tends to come and go. Some people experience acute flares that closely mimic appendicitis, making the distinction difficult without imaging.
Infections in the small intestine from bacteria like Salmonella or Yersinia can also inflame this same area, producing right-sided pain with diarrhea that typically resolves on its own within days to a week. If you’ve recently traveled, eaten undercooked food, or been around someone with a stomach bug, an infection is worth considering.
Gynecological Causes in Women
In women, the right ovary and fallopian tube sit in the lower right abdomen, and problems with either one can cause pain that’s easily confused with appendicitis or other digestive issues. A ruptured or twisted ovarian cyst causes sudden, sharp pain on the affected side. Ovarian torsion, where the ovary twists on its blood supply, produces severe pain that often comes with nausea and vomiting.
An ectopic pregnancy, where a fertilized egg implants outside the uterus (most often in a fallopian tube), is a medical emergency. It causes one-sided pelvic pain, often with vaginal bleeding, and can be life-threatening if the tube ruptures. Because ectopic pregnancies can mimic other conditions on ultrasound, with ruptured ectopic pregnancies mistaken for a ruptured ovarian cyst in up to 75% of cases on imaging, a pregnancy test is one of the first things checked when a woman of reproductive age comes in with acute right-sided pain.
How Doctors Figure Out the Cause
Your doctor will start with a physical exam and your history: where the pain started, how it moved, what makes it better or worse, and any accompanying symptoms like fever, changes in bowel habits, or urinary issues. Blood tests check for signs of infection or inflammation, and a urine test can rule out kidney stones or urinary tract infections.
For imaging, ultrasound is often the first step because it’s fast, widely available, and doesn’t involve radiation. It’s particularly good at detecting gallbladder problems and gynecological conditions. If the ultrasound is inconclusive or appendicitis is suspected, a CT scan with contrast is the next move. CT is more sensitive than ultrasound for detecting appendicitis and gives a clearer picture of the entire abdomen. A common and effective approach is to start with ultrasound and move to CT only when needed.
Signs That Need Immediate Attention
Certain features of right-sided abdominal pain signal a potentially serious problem. Severe pain that comes on suddenly, a rigid or board-like abdomen, high fever, vomiting blood or passing dark tarry stools, or feeling lightheaded and faint all warrant emergency evaluation. Pain that gets noticeably worse when you hit a bump while riding in a car, or when someone accidentally bumps into you, suggests irritation of the abdominal lining. If you’re pregnant and experiencing one-sided pain with vaginal bleeding, that combination needs to be assessed immediately to rule out an ectopic pregnancy.
Pain that’s been gradually worsening over days without improving, especially with fever or an inability to keep food down, also deserves prompt medical evaluation rather than a wait-and-see approach.