This study is examining how other illnesses (comorbidities) affect the chance of complications after belly (abdominal) surgery. **Postoperative complications** are problems that happen after surgery, like infections or breathing issues. Doctors want to better predict these risks to help keep patients safe. **Concomitant diseases** mean having other illnesses at the same time, like heart or lung diseases, which might increase surgery risks. **ASA physical status class** is a way to rate a patient's health before surgery, with classes 1-3 being healthier than higher numbers. The study will look at many factors, such as age, gender, and types of illness.

• Participants need to have abdominal surgery and be rated as ASA class 1-3.
• The study will track patients' health before and after surgery.
• Participation involves filling out forms and possibly some medical tests.

This research could help doctors predict who might have problems after surgery, making surgeries safer for everyone.