Due to excessive drinking, Avicii suffered from acute pancreatitis for years before his death. Symptoms of acute pancreatitis can be upper abdominal pain that can cover the back too it might get worse after eating food because of the load on the digestive system, increased heart rate, nausea, and vomiting, fever, tenderness when touching the abdomen.  Apart from this, he had mental health concerns like depression and burnouts too.