Right upper quadrant pain, the discomfort felt beneath the ribs on your right side, most commonly traces back to the gallbladder. But the list of possible causes is longer than most people expect, stretching from obvious culprits like gallstones to surprising ones like pneumonia and even shingles. Because so many different organs and structures sit in or refer pain to this area, sorting out the source matters more here than in almost any other part of the abdomen.
The Gallbladder Is the Usual Suspect
If you show up to an emergency department with sudden pain under your right ribs, gallbladder disease is what clinicians think about first, and for good reason. Acute cholecystitis, the inflammation of the gallbladder, typically causes sharp right upper quadrant pain, fever, and nausea that often gets worse after eating. In the vast majority of cases, a gallstone physically blocks the duct that drains the gallbladder, triggering the inflammation. A small fraction of acute cholecystitis cases happen without any stones at all, usually in people who are already critically ill for other reasons.1JAMA. Acute Cholecystitis: A Review
The pain tends to be steady rather than crampy, and it often radiates toward the right shoulder blade. Pressing on the right upper quadrant during an exam typically reproduces the tenderness. A specific bedside test called the Murphy sign, where the examiner presses under the right ribs while you breathe in deeply, has reasonable accuracy for pointing toward cholecystitis. Pooled data on clinical signs show that right upper quadrant tenderness itself is quite sensitive for cholecystitis but not very specific, meaning the tenderness is usually present when the gallbladder is inflamed but can also appear with other problems. The Murphy sign is more specific but misses a fair number of cases.2Medicine Plus. The diagnostic accuracy of physical signs: practice experience compared with research evidence – Section: 3.4. Acute cholecystitis
Ultrasound is the go-to imaging study. It picks up gallstones well and can show signs of gallbladder wall thickening or surrounding fluid. Its sensitivity and specificity for acute cholecystitis are each around 80 to 83 percent. When ultrasound leaves the diagnosis uncertain, a nuclear medicine scan called hepatobiliary scintigraphy becomes the gold standard. It works by injecting a tracer that gets excreted in bile; if the tracer never fills the gallbladder, that strongly suggests the cystic duct is blocked.3JAMA. Acute Cholecystitis: A Review CT scans are also useful, particularly when a complication like a gallbladder perforation or abscess is suspected.4PubMed. Imaging evaluation for acute pain in the right upper quadrant
Bile Duct Infections and Stones
Moving downstream from the gallbladder, problems in the bile ducts themselves can produce right upper quadrant pain that looks and feels a lot like a gallbladder attack. Acute cholangitis is an infection of the bile ducts, usually triggered by a stone lodged in the common bile duct, though benign or malignant strictures can also be responsible.5PubMed. Acute cholangitis: current concepts The classic presentation involves three symptoms together: fever, jaundice, and abdominal pain, a combination historically called Charcot’s triad.6Gastroenterology Clinics of North America. Management of Common Bile Duct Stones
The trouble is that in practice, especially among older patients, the full triad often doesn’t show up. A case report described an 84-year-old woman with cholangitis who presented not with belly pain but with chest pain and cough, a picture that looked nothing like a biliary problem until further workup revealed the true diagnosis.7PubMed Central. Common Pathology With Atypical Presentation: Acute Cholangitis This is why clinicians keep cholangitis on the radar for elderly patients with vague or misleading symptoms. Untreated, bile duct infection can progress to sepsis and organ failure, so catching it early is critical.
Functional Biliary Disorders
Not everyone with biliary-type pain has a stone or visible inflammation. Some people experience recurrent episodes of upper abdominal pain that look exactly like gallbladder attacks, but ultrasound and bloodwork come back normal. Two functional disorders can explain this pattern. Dysfunctional gallbladder disorder involves the gallbladder not emptying properly, while sphincter of Oddi dysfunction involves the muscular valve where the bile duct meets the small intestine going into spasm or not opening as it should. Both are often considered when no structural cause is found.8PubMed. Gallbladder and Sphincter of Oddi Disorders
Sphincter of Oddi dysfunction can cause chronic biliary pain or even recurrent bouts of pancreatitis because the backed-up flow affects the pancreatic duct too.9PubMed Central. Sphincter of Oddi dysfunction: managing the patient with chronic biliary pain Diagnosing these conditions is tricky, partly because you first have to rule out every structural cause, and partly because the tests for measuring gallbladder emptying and sphincter pressures have their own limitations. These disorders are also relevant in people who have already had their gallbladder removed and still have pain, a scenario discussed further below.
Pneumonia and Other Chest Problems That Mimic Belly Pain
One of the most underappreciated causes of right upper quadrant pain has nothing to do with the abdomen at all. Lower-lobe pneumonia, particularly on the right side, can cause pain that is felt entirely in the belly, sometimes severe enough to mimic a surgical emergency. The mechanism involves the diaphragm: infection in the lower lung irritates the underside of the diaphragm, and the nerves serving the diaphragm also supply sensation to parts of the abdomen and shoulder. The result is pain that gets referred downward.10PubMed Central. Rare presentation of community acquired pneumonia resulted in laparoscopic intervention in adult
Case reports have documented patients who presented with what seemed like a clear-cut acute abdomen, only for imaging to reveal a right lower lobe lung infiltrate and no abdominal pathology. In one published case, a young, previously healthy man arrived with severe right upper quadrant pain and fever. His abdominal symptoms came first, and the respiratory signs like cough and shortness of breath only developed later, delaying the correct diagnosis.11PubMed Central. Community-Acquired Pneumonia Manifested by Acute Abdominal Pain: A Case Report The practical takeaway is that a chest X-ray is a reasonable step in the workup of unexplained right upper quadrant pain, especially if ultrasound of the gallbladder looks normal.
When Appendicitis Hides in the Wrong Spot
Appendicitis is almost synonymous with right lower quadrant pain. But the appendix doesn’t always sit where anatomy textbooks draw it. In some people, the appendix points upward behind the cecum, a position called retrocecal. When this kind of appendix gets inflamed, the pain can land squarely in the right upper quadrant, far from where anyone would expect appendicitis to hurt. One case report documented a patient whose CT scan revealed a dilated, inflamed appendix with small calcified stones, all in the retrocecal position, causing right upper quadrant pain that had been attributed to other diagnoses.12PubMed Central. A Rare Presentation of Chronic Appendicitis in the Right Upper Quadrant: A Case Report
This kind of ascending retrocecal appendicitis can be clinically indistinguishable from acute gallbladder, liver, biliary, or kidney problems.13PubMed Central. Ascending retrocecal appendicitis presenting with right upper abdominal pain: utility of computed tomography CT scanning is especially useful in these situations because it can directly visualize the appendix regardless of where it happens to be. The condition is uncommon, but it matters because a missed appendicitis can rupture, turning a treatable problem into a dangerous one.
Musculoskeletal and Nerve-Related Causes
Pain that seems to come from deep inside the abdomen sometimes actually originates in the abdominal wall, the ribs, or the nerves that run along them. These causes are easy to overlook because the pain can feel indistinguishable from an internal organ problem.
Slipping rib syndrome is one example. It involves hypermobility of the lower rib cartilage, which allows a rib tip to slip under or over the one beside it, trapping the intercostal nerve. The result is a burning, often disabling pain in the lower chest and upper abdomen. Many people with this condition undergo extensive testing for gallbladder disease, liver problems, or other abdominal diagnoses before the rib itself is identified as the source.14PubMed Central. A new sign of the slipping rib syndrome?
Herpes zoster, or shingles, is another mimic worth knowing about. The virus reactivates along a nerve root and typically produces a band of blistering rash on one side of the body. But the pain can precede the rash by several days. During that window, a patient with shingles along the right thoracic nerve roots may feel severe right upper quadrant pain with no visible skin changes at all, creating a convincing impression of an acute abdominal emergency.15PubMed Central. Shingles (Herpes Zoster) Mimicking Acute Abdomen The rash eventually appears and clarifies the diagnosis, but in the meantime, unnecessary imaging, bloodwork, and even surgical consultations can pile up.
Pelvic Infections That Refer Pain Upward
In young women, right upper quadrant pain occasionally turns out to be a complication of pelvic inflammatory disease. Fitz-Hugh-Curtis syndrome involves infection tracking from the pelvis up to the liver capsule, creating inflamed adhesions on the surface of the liver. The resulting pain is felt in the right upper quadrant and can mimic cholecystitis or hepatitis. It is associated with chlamydia and gonorrhea infections. Because pelvic symptoms may be mild or absent, the connection between a sexually transmitted infection and what appears to be a liver-area problem is easy to miss.16PubMed Central. A Diagnosis Not to Miss: A Case of Fitz-Hugh-Curtis Syndrome
This diagnosis tends to come up in women of reproductive age with persistent or unexplained right upper quadrant pain, especially when standard biliary workup is negative. Screening for sexually transmitted infections becomes an important part of the evaluation in these cases.
Right Upper Quadrant Pain During Pregnancy
Pregnancy adds a layer of urgency to right upper quadrant pain because of a condition called HELLP syndrome (hemolysis, elevated liver enzymes, and low platelets). HELLP is a severe complication of preeclampsia and can develop rapidly. About two-thirds of affected patients report right upper quadrant or upper-middle abdominal pain, along with nausea, vomiting, or headaches.17PubMed Central. A typical presentation of previable HELLP syndrome: a case report
What makes HELLP dangerous is its potential to cause liver damage. Endothelial cell injury leads to reduced blood flow in the liver, which can progress to hepatic necrosis and, in rare cases, subcapsular hematoma or even rupture of the liver itself. One case report described a pregnant woman who developed sudden right upper quadrant pain and hemodynamic collapse; bedside ultrasound revealed blood in the abdomen from a ruptured liver hematoma caused by HELLP syndrome.18PubMed Central. Hepatic rupture complicating HELLP syndrome in a low-resource setting: a case report These cases are medical emergencies that demand immediate surgery. For any pregnant person experiencing persistent right upper quadrant pain, especially with high blood pressure or abnormal labs, rapid evaluation is essential.
Vascular Causes Involving the Liver
The liver has a complex blood supply, and when the veins draining the liver become blocked, the result can be severe pain, swelling of the liver, and accumulation of fluid in the abdomen. Budd-Chiari syndrome is the condition that results from thrombotic blockage of the hepatic veins. It can present with upper abdominal or epigastric pain, rapid development of ascites (fluid in the belly), and deteriorating liver function.19PubMed. The transjugular intrahepatic portosystemic stent-shunt (TIPS) as rescue therapy for complete Budd-Chiari syndrome and portal vein thrombosis It is uncommon, but it tends to affect younger adults and is often associated with underlying blood-clotting disorders. When someone presents with right upper quadrant pain, ascites, and liver failure without an obvious explanation like alcohol or viral hepatitis, Budd-Chiari syndrome belongs on the list of possibilities.
Pain That Persists After Gallbladder Removal
Having your gallbladder taken out usually resolves gallstone-related pain, but a subset of patients continue to have symptoms afterward. This is broadly referred to as postcholecystectomy syndrome, which isn’t a single disease but rather a catch-all for persistent or recurring pain, jaundice, or digestive complaints following surgery. The causes vary. Some patients have a retained stone in the common bile duct that wasn’t caught at the time of surgery. Others develop bile duct injuries, bile leaks, strictures, or adhesions as a result of the procedure itself.20PubMed. Postcholecystectomy syndrome (PCS)
In other cases, the original diagnosis was wrong: the pain was never coming from the gallbladder at all, so removing it didn’t help. Functional biliary disorders like sphincter of Oddi dysfunction, mentioned earlier, can produce identical symptoms and sometimes only become apparent once the gallbladder has been ruled out by its absence. Evaluating postcholecystectomy pain typically involves repeat imaging, sometimes with MRI of the bile ducts, and careful reconsideration of the differential diagnosis.
Right Upper Quadrant Pain in Children
Children are far less likely than adults to have gallstones, so when a child presents with right upper quadrant pain, clinicians consider a somewhat different set of possibilities. One condition relatively unique to pediatric patients is choledochal cyst, a rare but serious abnormality of the bile ducts in which a portion of the duct becomes abnormally dilated. Choledochal cysts are usually found in young children, often during the first year of life. The classic presentation involves jaundice, abdominal pain, and a palpable abdominal mass, though many children present with pain alone.21PubMed Central. Choledochal Cyst Mimicking Gallbladder with Stones in a Six-Year-Old with Right-sided Abdominal Pain
In one case, a child presenting to an emergency department with right-sided abdominal pain was found on ultrasound to have a choledochal cyst that initially mimicked a gallbladder full of stones. Choledochal cysts carry a risk of rupture, infection, and long-term malignancy if left untreated, and a ruptured cyst can present as an acute surgical emergency in a child with right upper quadrant tenderness.22PubMed. Traumatic Rupture of Choledochal Cyst in Children: Use of Computed Tomography in the Emergency Department Bedside ultrasound is a valuable first step in the pediatric emergency setting because it can identify cystic structures and guide the next stage of workup without radiation exposure.
The Imaging Pathway
Regardless of the suspected cause, imaging plays a central role in evaluating right upper quadrant pain. Ultrasound is the starting point in most cases. It is fast, widely available, radiation-free, and excellent at visualizing gallstones, bile duct dilation, liver masses, and fluid collections. For more complex biliary anatomy or when ductal stones are suspected, MRI of the bile ducts (magnetic resonance cholangiopancreatography) provides detailed maps without the need for an invasive procedure.23PubMed. Imaging evaluation for acute pain in the right upper quadrant
CT scanning fills a different role. It is better than ultrasound at picking up complications like abscesses, perforations, and vascular problems, and it is the most useful tool for spotting an unexpectedly positioned appendix or a lung process mimicking abdominal disease. In pregnant patients, ultrasound and MRI are preferred over CT to avoid radiation, though CT can still be used when the clinical situation demands it. The choice of imaging depends on what the clinician suspects after taking a history and examining you, which is why the conversation and physical exam still matter even in an era of advanced imaging.
Referred Pain and Why Location Can Mislead
One thread running through many of these diagnoses is referred pain, the phenomenon where you feel pain in a location that is different from where the problem actually is. The diaphragm is the biggest culprit in the right upper quadrant. It sits between the chest and the abdomen, and its nerve supply overlaps with structures in both regions. Irritation of the diaphragm from below (by a liver abscess, subphrenic collection, or inflamed gallbladder) can cause shoulder pain. Irritation from above (by a right lower lobe pneumonia) can cause abdominal pain.24PubMed Central. Rare presentation of community acquired pneumonia resulted in laparoscopic intervention in adult The exact mechanisms of referred pain are still not fully understood, but diaphragmatic irritation is one of the best-documented pathways.25Cureus. Postprandial Referred Shoulder Pain: A Case Report
This is part of what makes right upper quadrant pain diagnostically rich and sometimes confusing. The liver, gallbladder, bile ducts, right kidney, hepatic flexure of the colon, right adrenal gland, and the undersurface of the right diaphragm all live in or near this quadrant. Add in referred pain from the chest and the abdominal wall, and you have a region where a careful history, including timing, relationship to meals, associated symptoms, and reproductive history, becomes just as important as any blood test or scan.