Signs of acute cholecystitis are clinical indicators of sudden gallbladder inflammation, most often due to gallstone obstruction. They include severe right upper quadrant abdominal pain, fever, nausea, vomiting, and a positive Murphy's sign-a physical exam finding where pain worsens during deep inspiration when the gallbladder is palpated.
Acute cholecystitis occurs when bile flow out of the gallbladder is blocked, usually by a gallstone lodged in the cystic duct. This leads to distension, ischemia, and inflammation. Without treatment, complications such as gangrene, perforation, or sepsis can develop. Early recognition of signs is critical to prevent progression.
The condition affects approximately 10-15% of adults with gallstones annually, according to the American Gastroenterological Association. It is more common in women, individuals over 40, and those with obesity or diabetes. Prompt diagnosis reduces hospital stay and surgical risk.
Pain in acute cholecystitis typically begins abruptly, often after a fatty meal. It localizes to the right upper quadrant (RUQ), may radiate to the right shoulder or scapular region, and persists for hours. The pain is constant and sharp, unlike the intermittent colic seen in biliary colic.
Fever above 38°C (100.4°F) suggests infection or necrosis. Nausea and vomiting occur in about 60% of cases, though they are non-specific. Patients may appear ill, with tachycardia or hypotension in severe cases.
A physical exam finding called Murphy's sign is highly predictive. During deep palpation of the RUQ, the patient stops breathing in when pressure is applied. This reflex occurs because movement of the diaphragm during inspiration increases tension on the inflamed gallbladder. A positive sign has a sensitivity of 70-80% and specificity of 90% in diagnosing acute cholecystitis, per a 2021 review in *Gastroenterology*.
Ultrasound is the first-line imaging test. It detects gallstones in 95% of cases, gallbladder wall thickening (>3 mm), pericholecystic fluid, and a positive sonographic Murphy's sign. Sensitivity is 90-95%, specificity 95%.
CT scans are less sensitive for detecting stones but useful when complications are suspected-such as emphysematous cholecystitis (gas in the gallbladder wall) or perforation. MRI with MRCP can visualize biliary anatomy and detect ductal obstructions but is not routine due to cost and availability.
Blood tests show elevated white blood cell count (>11,000/μL) in 60-70% of patients. Liver enzymes (ALT, AST, alkaline phosphatase) may rise mildly. Bilirubin is normal unless there is common bile duct obstruction.
Acute cholecystitis is frequently mistaken for peptic ulcer disease, pancreatitis, or pneumonia. Right-sided pleuritic chest pain from pneumonia can mimic RUQ pain. Pancreatitis causes epigastric pain radiating to the back, not RUQ.
Patients with diabetes may have blunted symptoms. A 2019 study in *The Journal of Emergency Medicine* found that 30% of diabetic patients with acute cholecystitis presented with minimal pain or no fever. This delays diagnosis and increases complication rates.
Another confusion arises between acute and chronic cholecystitis. Chronic cases involve repeated episodes of mild inflammation and fibrosis. They lack the sudden onset, fever, and positive Murphy's sign seen in acute forms. Imaging shows a shrunken, thick-walled gallbladder with calcifications (porcelain gallbladder).
There are two main types: calculous (gallstone-related) and acalculous (no stones). Calculous cholecystitis accounts for 90-95% of cases. Acalculous cholecystitis occurs in critically ill patients, especially those on mechanical ventilation or with sepsis. It has higher mortality-up to 30%-due to delayed detection.
| Type | Prevalence | Key Features | Common Triggers |
|---|---|---|---|
| Calculous | 90-95% | Gallstones, RUQ pain, positive Murphy's sign | Fatty meals, rapid weight loss |
| Acalculous | 5-10% | No stones, high mortality, subtle symptoms | ICU admission, sepsis, trauma |
Emphysematous cholecystitis is a rare but dangerous variant caused by gas-producing bacteria in the gallbladder wall. It appears as air bubbles on CT scan and requires urgent surgery. Mortality exceeds 50% if untreated.
A 58-year-old woman with type 2 diabetes presents with 6 hours of worsening right upper quadrant pain. She reports nausea but no vomiting. Important signs: temperature 38.3°C, heart rate 102 bpm. On exam, she winces when the RUQ is pressed and holds her breath during deep inspiration-positive Murphy's sign.
An ultrasound shows a 1.2 cm stone in the cystic duct, gallbladder wall thickness of 5 mm, and free fluid around the gallbladder. WBC is 14,500/μL. She is admitted, started on IV antibiotics, and scheduled for laparoscopic cholecystectomy within 24 hours.
This case illustrates how classic signs-pain, fever, Murphy's sign-combined with imaging and labs confirm acute cholecystitis. Delaying surgery increases risk of gangrene or perforation.
In my time as a hospitalist, I've seen multiple patients with acute cholecystitis misdiagnosed as gastritis or musculoskeletal pain. One elderly man with dementia had persistent RUQ discomfort. His family reported he "just wasn't acting right." An ultrasound revealed a distended gallbladder with sludge and a positive sonographic Murphy's sign. He underwent surgery and recovered fully. This case reinforced that signs of acute cholecystitis must be actively sought, especially in atypical presentations.
Signs of acute cholecystitis are not just pain-they include systemic signs like fever, lab abnormalities, and specific physical exam findings. Recognizing them early prevents complications. Ultrasound remains the gold standard for confirmation.
Early intervention based on clear signs of acute cholecystitis improves recovery and reduces hospital burden. Always consider this diagnosis in patients with RUQ pain, especially after eating.