AEIOU TIPS. This is easily one of the most important¬†mnemonics of emergency medicine because it represents the differential diagnosis for altered mental status. Obviously, this is not meant to be an exhaustive list, but it certainly provides a good framework to start with. Even as a resident, I still will write out this differential¬†when I’m placing orders on a complicated, altered mental status patient. It keeps me from ¬†missing something obvious, and it’s crucial for your training as a medical student.