Can you please describe the differences in symptoms between appendicitis and upset stomach for kids?

Intensity/location: Most kids with a soft but tender tummy will not have something bad happening. The appendix is usually sitting next to the upper part of the right thigh muscle, so often a kid that won't walk (from pain in belly or rt leg) or can't hop up/dn may be an appi. The worse the kid looks the more likely he needs to be seen. Even with new tech, half of kids today are ruptured by the time of surgery.

Type of pain: Early in the course of appendicitis, the symptoms are actually quite similar: crampy, generalized pain+/- nausea+/-vomiting+/-decreased appetite. However, with appendicitis the pain "changes", often becoming constant, well-localized to the right lower abdomen, progressively-worsening, bothered by movement+/- fever+/-chills. When in doubt, err on the safe side and seek urgent medical attention.