Causes of cholecystitis
Cholecystitis is when your gallbladder is inflamed. Gallbladder inflammation can be caused by: Gallstones. Most often, cholecystitis is the result of hard particles that develop in your gallbladder (gallstones). Gallstones can block the tube (cystic duct) through which bile flows when it leaves the gallbladder. Bile builds up in the gallbladder, causing inflammation. Tumor. A tumor may prevent bile from draining out of your gallbladder properly. This causes bile buildup that can lead to cholecystitis. Bile duct blockage. Stones or thickened bile and tiny particles (sludge) can block the bile duct and lead to cholecystitis. Kinking or scarring of the bile ducts can also cause blockage. Infection. AIDS and certain viral infections can trigger gallbladder inflammation. Severe illness. Very severe illness can damage blood vessels and decrease blood flow to the gallbladder, leading to cholecystitis.