Cholangitis is a medical condition that occurs when the bile ducts that carry bile from the liver to the small intestine become inflamed or infected. It is a serious condition that can lead to severe complications if left untreated. Symptoms of cholangitis include abdominal pain, fever, jaundice, and dark urine. The most common cause of cholangitis is a bacterial infection, but other causes include gallstones, tumors, or physical blockages. Diagnosis of cholangitis usually begins with a physical exam and laboratory tests to check for signs of infection, such as elevated white blood cell count and liver enzyme levels. Imaging tests, such as an ultrasound, CT scan, or MRI, can be used to look for blockages or other abnormalities in the bile ducts. Treatment of cholangitis depends on the cause. Bacterial infections are usually treated with antibiotics, while gallstones or tumors may require surgery. Other treatments may include bile drainage procedures to remove blockages or medications to reduce inflammation. In some cases, cholangitis can lead to serious complications, such as liver failure or bile duct cancer. It is important to seek prompt medical attention if you have any of the symptoms of cholangitis. With early diagnosis and treatment, the prognosis for cholangitis is usually good.