Literally, kasha means difficulty. Hence, Shticky Guy, Wolf, and Pashutateh Yid are correct. I would explain it by saying that it refers to an inconsistency; the statement might be “difficult” because it contradicts a different statement made by the same person, or made by someone of greater authority, or logically inconsistent. A shaila is a query,often for psak halacha, but not necessarily.
