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Acute cholecystitis is inflammation of the gallbladder. It usually occurs when a gallstone blocks the cystic duct.
Gallstones are small stones, usually made of cholesterol, that form in the gallbladder. The cystic duct is the main opening of the gallbladder.
Gallstones are very common, affecting about 1 in 10 adults in the UK. They don't usually cause symptoms, but they can occasionally cause episodes of pain (biliary colic) or acute cholecystitis.
Acute cholecystitis is potentially serious. It usually needs to be treated in hospital with rest, intravenous fluids and antibiotics.
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The main symptom of acute cholecystitis is a sudden sharp pain in the upper right-hand side of your tummy (abdomen). This pain spreads towards your right shoulder.
The affected part of the abdomen is usually very tender, and breathing deeply can make the pain worse.
Unlike other types of abdominal pain, the pain of acute cholecystitis is usually persistent and doesn't go away within a few hours.
Some people may have additional symptoms, such as:
See your GP as soon as possible if you develop sudden and severe abdominal pain, particularly if it lasts longer than a few hours or is accompanied by other symptoms, such as jaundice and a fever.
It's important for acute cholecystitis to be diagnosed as soon as possible as there's a risk serious complications could develop if it isn't treated promptly.
The causes of acute cholecystitis can be grouped into two main categories: calculous cholecystitis and acalculous cholecystitis.
Calculous cholecystitis is the most common, and usually less serious, type of acute cholecystitis. It accounts for around 95% of all cases.
Calculous cholecystitis develops when the main opening to the gallbladder, called the cystic duct, gets blocked by a gallstone or a substance known as biliary sludge.
Biliary sludge is a mixture of bile, a liquid produced by the liver that helps digest fats, and small cholesterol and salt crystals.
The blockage in the cystic duct causes bile to build up in the gallbladder, increasing the pressure inside it and causing it to become inflamed. In around one in every five cases, the inflamed gallbladder also becomes infected by bacteria.
Acalculous cholecystitis is a less common, but usually more serious, type of acute cholecystitis. It usually develops as a complication of a serious illness, infection or injury that damages the gallbladder.
If you have severe abdominal pain, your GP will probably carry out a simple test called Murphy's sign. You'll be asked to breathe in deeply with your GP's hand pressed on your tummy, just below your rib cage.
Your gallbladder will move downwards as you breathe in. If you have cholecystitis, you'll experience sudden pain as your gallbladder reaches your doctor's hand.
If your symptoms suggest you have acute cholecystitis, your GP will refer you to hospital immediately for further tests and treatment.
Tests you may have in hospital include:
Other scans – such as an X-ray, computerised tomography (CT) scan or magnetic resonance imaging (MRI) scan – may also be carried out to examine your gallbladder in more detail if there's any uncertainty about your diagnosis.
If you're diagnosed with acute cholecystitis, you'll probably need to be admitted to hospital for treatment.
Initial treatment will usually involve:
You'll also be given antibiotics if it's thought you have an infection. These often need to be continued for up to a week, during which time you may need to stay in hospital, or you may be able to go home.
After initial treatment, any gallstones that may have caused acute cholecystitis usually fall back into the gallbladder and the inflammation will often settle down.
Removing your gallbladder may be recommended at some point after initial treatment to prevent acute cholecystitis recurring and reduce your risk of developing potentially serious complications. This type of surgery is known as a cholecystectomy.
Although uncommon, an alternative procedure called a percutaneous cholecystostomy may be carried out if you're too unwell to have surgery. This is where a needle is inserted through your abdomen to drain away the fluid that's built up in the gallbladder.
If you're fit enough to have surgery, your doctors will decide when the best time to remove your gallbladder is. In some cases you may need to have surgery immediately or in the next day or two, or it may be necessary to wait a few weeks until the inflammation has settled down.
Surgery can be carried out in three ways:
Although some people who've had their gallbladder removed have reported symptoms of bloating and diarrhoea after eating certain foods, it's possible to lead a perfectly normal life without a gallbladder. The organ can be useful, but it's not essential as your liver will still produce bile to digest food.
Read more about recovering from gallbladder removal.
Without appropriate treatment, acute cholecystitis can sometimes lead to potentially life-threatening complications.
The main complications of acute cholecystitis are:
Emergency surgery to remove the gallbladder is needed to treat these complications in about one in every five cases of acute cholecystitis.
It isn't always possible to prevent acute cholecystitis, but you can lower your risk of developing it by reducing your risk of getting gallstones.
One of the main things you can do to lower your chances of getting gallstones is to adopt a healthy, balanced diet and reduce the number of high-cholesterol foods you eat, as cholesterol is thought to contribute to the formation of gallstones.
However, low-calorie rapid weight loss diets should be avoided because there's evidence they can disrupt your bile chemistry and actually increase your risk of developing gallstones. A more gradual weight loss plan is best.
Read more about preventing gallstones.