Generally speaking, mild pancreatitis is just a local inflammation of the pancreas, usually manifested as upper abdominal pain, nausea, vomiting, and bloating — symptoms of the gastrointestinal tract. Severe pancreatitis, however, is much more serious than mild pancreatitis. In severe pancreatitis, not only is the pain in the local pancreas area more intense and the abdominal bloating more pronounced, but there is also a lot of effusion accumulating in the abdomen. Severe pancreatitis can also affect many other organs, such as the lungs, which are most commonly affected. It can lead to patients developing acute respiratory distress syndrome, characterized by severe hypoxemia, with many patients requiring mechanical ventilation treatment. Another organ that is commonly affected is the kidney, with many patients with severe pancreatitis experiencing acute renal failure, reduced urine output, or even anuria. Severe pancreatitis can also affect the heart, brain, and other organs, leading to functional abnormalities in these organs. Therefore, besides affecting the local pancreas, severe pancreatitis can involve other important organs, resulting in multiple organ dysfunctions.