The differences between gastroenteritis and appendicitis are as follows: 1. different causes: gastroenteritis is mainly due to unclean and unhygienic diet, while appendicitis is mainly due to the invasion of the appendix by fecal stones or bacterial infection; 2. different main symptoms: the main symptoms of gastroenteritis are vomiting, diarrhea and abdominal pain, and abdominal pain is mostly around the umbilicus, while the main symptoms of appendicitis are metastatic right lower abdominal pain, which can be accompanied by nausea and vomiting, and generally there is no diarrhea; 3. different treatment methods: gastroenteritis can be effectively treated only through non-surgical treatment, while appendicitis patients are recommended to have timely surgery.