Chronic pancreatitis occurs most commonly after an episode of acute pancreatitis, and is the result of ongoing inflammation of the pancreas. In about 45% of people, chronic pancreatitis is caused by prolonged alcohol use. Other causes include gallstones, hereditary disorders of the pancreas, cystic fibrosis, high triglycerides and certain medicines. Damage to the pancreas from excessive alcohol use may not cause symptoms for many years, but the person may suddenly develop severe pancreatitis symptoms including severe pain and loss of pancreatic function resulting in digestion and blood sugar abnormalities.