köken: Compound of 御 (o-, honorific prefix) + 中 (naka, “insides; innards, stomach”). Originally coined as a deliberately indirect 女房詞 (nyōbō kotoba, “woman's word”) for 腹 (hara, “belly, gut”). The use of the 腹 character to spell 中 (naka) appears to be a relatively recent shift; many dictionaries still list 御中 or お中 as the standard spelling for this term, but usage trends clearly show that this お腹…
aile: お腹が空く: → to become hungry, お腹を壊す: → to become sick to one's stomach, to become ill in one's gut, お腹を痛める: → to give birth