Right-sided pain has dozens of possible causes, and the most likely explanation depends on exactly where you feel it, how intense it is, and whether it came on suddenly or built up over time. The right side of your body houses your liver, gallbladder, appendix, right kidney, and parts of your intestines, so pain in this area can range from trapped gas that passes in minutes to a surgical emergency like appendicitis. Here’s how to start narrowing it down.
Upper Right Pain: Gallbladder and Liver
Pain beneath your right rib cage most often points to the gallbladder or liver. The gallbladder stores bile that helps digest fat, and problems tend to flare after meals, especially rich or greasy ones. The mildest form, called biliary colic, is an intermittent ache that comes and goes. If a gallstone blocks the bile duct more completely, the pain becomes severe, constant, and can last for days. Nausea, gas, and chronic diarrhea after eating are other hallmarks of gallbladder trouble.
Liver-related causes include fatty liver disease, alcohol-related liver inflammation, viral hepatitis, and toxic reactions to medications or supplements. Liver pain is usually a dull, deep ache under the ribs rather than a sharp stab. If your skin or the whites of your eyes look yellowish, that’s a strong signal that something is affecting your liver or bile ducts and needs prompt evaluation.
When doctors investigate upper right pain, ultrasound is the first imaging test they reach for. It’s fast, gives a clear picture of gallstones and bile duct swelling, and can rule out several alternative diagnoses at once. A CT scan is typically reserved for cases where the ultrasound doesn’t explain the pain.
Lower Right Pain: Appendicitis and Beyond
Sharp or worsening pain in the lower right part of your belly is the classic signal for appendicitis, and it’s the cause most people (rightly) worry about. The pattern is distinctive: pain usually starts as a vague ache around the belly button, then within hours migrates to the lower right side, where it becomes constant and severe. It gets worse when you cough, walk, or make any jarring movement. Nausea, loss of appetite, a low-grade fever that climbs over time, and bloating often come along with it.
Not every twinge in that area is your appendix, though. Gas pain can show up anywhere in the abdomen and may feel moderate or even intense for a short stretch. The key difference is that gas pain feels like it’s moving through the intestines and improves quickly once you pass gas or have a bowel movement. Appendicitis pain settles into one spot, locks in, and only gets worse. If your pain started mild, stayed in roughly the same place, and resolved within an hour or two, gas or a temporary cramp is a much more likely explanation.
During pregnancy, the appendix gets pushed higher by the growing uterus, so appendicitis pain can show up in the upper abdomen instead of the lower right. That shift catches many people off guard.
Flank and Back Pain: Kidney Stones
If the pain is more toward your side and back, below the ribs, a kidney stone is a strong possibility. Kidney stone pain is notoriously intense: a serious, sharp pain that comes in waves, sometimes radiating down into your lower abdomen or groin as the stone moves through the urinary tract. The pain can shift location and change in intensity over the course of hours.
Other signs that point toward a stone include pink, red, or brown urine, a persistent urge to urinate even when little comes out, cloudy or foul-smelling urine, and nausea. Fever and chills on top of kidney stone symptoms suggest an infection has developed, which is a reason to seek care quickly.
Pelvic Pain in Women
For women, right-sided pain that sits low in the pelvis opens up a separate list of possibilities. Ovarian cysts are common and often painless, but when one ruptures or grows large, it can cause a sudden, sharp pain on the affected side. Endometriosis, pelvic inflammatory disease, and uterine fibroids can all produce right-sided pelvic pain that ranges from a dull ache to something much more disruptive.
Ectopic pregnancy, where a fertilized egg implants outside the uterus (usually in a fallopian tube), causes one-sided pelvic pain that can become an emergency if the tube ruptures. Any woman of reproductive age with sudden, severe right-sided pelvic pain and a missed or unusual period should treat it as urgent.
Muscle and Rib Cage Pain
Not all right-sided pain comes from an organ. Strained muscles between the ribs, a pulled abdominal muscle, or even poor posture can produce pain that mimics something more serious. The distinguishing feature is that musculoskeletal pain tends to feel sharp and localized. You can usually point to the exact spot, and the pain changes predictably when you press on it, twist, or stretch. Organ pain, by contrast, is typically deeper, more spread out, duller, and harder to pinpoint.
If you recently exercised, lifted something heavy, or slept in an awkward position and can reproduce the pain by pressing on the sore area or moving a certain way, a muscle strain is the simplest explanation. It usually improves with rest over a few days.
Signs That Need Immediate Attention
Most right-sided pain turns out to be something manageable, but certain combinations of symptoms warrant a trip to the emergency room rather than a wait-and-see approach:
- Pain plus inability to keep fluids down. Persistent vomiting alongside abdominal pain can signal a serious obstruction or inflammation.
- Pain that gets worse with movement, coughing, or deep breaths and has been escalating over several hours. This pattern fits appendicitis and other conditions that can worsen rapidly.
- Fever with a rapid pulse alongside upper abdominal pain, which can indicate acute pancreatitis or an infected gallbladder.
- A rigid, swollen abdomen that is tender to the touch, suggesting possible perforation or peritonitis.
- Sudden, severe pain that hits its peak within minutes rather than building gradually.
Mild right-sided pain that improves on its own within a day or two is rarely dangerous. Pain that is constant, worsening, or accompanied by fever, vomiting, or changes in urine or stool color deserves a professional evaluation sooner rather than later.