What's the difference between gastroenterology and gastrointestinal surgery?

Gastroenterology is internal medicine, and gastrointestinal surgery is surgery. The two departments are essentially different. Many digestive diseases need surgery, and some only need medication. However, in recent years, many endoscopic techniques have been mastered in digestion, commonly known as minor internal surgery, and great breakthroughs have been made. So the two are completely different, but they are inseparable.