Here is an (ongoing) list of abbreviations used in the Yousmle Step 1, Pharmacology, and Step 2 cards, as well as some select ones you will likely see in your hospital/clinical rotations but that may not be in the cards themselves. If your abbreviation isn’t listed here, ask about it in the comments and I will add it to the list!
MC = Most Common
MCC = Most Common Cause
2/2 = Secondary To
h/o = History Of
i/s/o = In the Setting Of