There are two forms of pancreatitis. The acute form occurs suddenly and may be a severe, life-threatening illness with many complications. Usually, the patient recovers completely. If injury to the pancreas continues, such as when a patient persists in drinking alcohol, a chronic form of the disease may develop, bringing severe pain and reduced functioning of the pancreas that affects digestion and causes weight loss. This disease occurs when the pancreas suddenly becomes inflamed and then gets better.
Some patients have more than one attack but recover fully after each one.
Most cases of acute pancreatitis are caused either by alcohol abuse or by gallstones. Other causes may be use of prescribed drugs, trauma or surgery to the abdomen, or abnormalities of the pancreas or intestine. In rare cases, the disease may result from infections, such as mumps. In about 15 percent of cases, the cause is unknown. Acute pancreatitis usually begins with pain in the upper abdomen that may last for a few days.