The goal of this observational study is to learn about recurrent acute pancreatitis (RAP) .The main questions it aims to answer are:

1. What are the risk factors for RAP?
2. How to predict RAP?

All patients with acute pancreatitis will be given standardized treatment for the condition.

The researchers will compare the RAP group with the non-RAP group to find the risk factors for RAP.

Investigators retrospectively collected data from the Medical Information Mart for Intensive Care-IV (MIMIC-IV) database and from patients with acute pancreatitis (AP) in the Department of Gastroenterology of Clinical Medical College of Yangzhou University between January 2016 and December 2017, forming the primary and validation cohort, respectively.

Inclusion Criteria:

• Meeting the diagnostic criteria of acute pancreatitis (AP)
• Age ≥18 years
• Systematic examination and diagnostic information were available after admission

Exclusion Criteria:

• Not the first episode of AP
• The duration of hospital stay was less than 24 hours
• Died within the first episode of AP
• A history of chronic pancreatitis or tumor
• Pregnancy

We collected data from the Medical Information Mart for Intensive Care-IV (MIMIC-IV) database and from patients with acute pancreatitis in the Department of Gastroenterology of Clinical Medical College of Yangzhou University between January 2016 and December 2017, forming the primary and validation cohort, respectively.