 The patients characteristics age, gender, comorbidities and etiology of AP, laboratory values on admission, imaging findings and data of given treatments and interventional therapies and length of hospital stays are collected from hospital charts. Also the 30-day and hospital mortality will be recorded. Patients symptoms weight loss, diarrhea, abdominal pain and BMIs are recorded with physical examinations in the 1-2 months follow-up visit. 12 months after discharging from hospital the patients symptoms and BMIs are recorded with phone inquiries. 5-year survival after the first AP attack will be determined from hospital records. 