also: あいたっ
An exclamation of sudden pain, equivalent to 'ouch' or 'ow'. Used in casual, spoken Japanese.
あいた！足をぶつけた。
Ouch! I bumped my foot.
あいたっ、注射が痛い。
Ow, the shot hurts.
Katakana spelling, sometimes used for emphasis or in manga.
Katakana emphatic variant with a small ッ.
Kanji spelling using 痛 (pain); rarely used in practice.
Derived from the adjective 痛い (いたい, 'painful'), with the initial vowel lengthened for exclamatory effect.