Acute Cholecystitis: Acute cholecystitis begins suddenly, resulting in severe, steady pain in the upper abdomen. At least 95% of people with acute cholecystitis have gallstones. The inflammation almost always begins without infection, although infection may follow later. Inflammation may cause the gallbladder to fill with fluid and its walls to thicken.
Chronic Cholecystitis: Chronic cholecystitis is gallbladder inflammation that has lasted a long time. It almost always results from gallstones. It is characterized by repeated attacks of pain (biliary colic). In chronic cholecystitis, the gallbladder is damaged by repeated attacks of acute inflammation, usually due to gallstones, and may become thick-walled, scarred, and small. The gallbladder usually contains sludge (microscopic particles of materials similar to those in gallstones), or gallstones that either block its opening into the cystic duct or reside in the cystic duct itself.
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