noun, na-adjective
annoyance; irritation; vexation
Used for a feeling of irritation or frustration, often in the phrase 癪に障る (しゃくにさわる) meaning 'to get on one's nerves'.
彼の態度が癪に障った。
His attitude got on my nerves.
癪な言い方をしないでくれ。
Don't say it in such an irritating way.
noun
abdominal spasms; cramps; convulsions
Dated medical term for abdominal cramps or spasms; now mostly replaced by 腹痛 (ふくつう) or けいれん.
昔は癪という言葉が腹痛を指すのに使われた。
In the past, the word 癪 was used to refer to stomach cramps.
The kanji 癪 is a kokuji (Japanese-made character) combining 疒 (sickness) and 積 (accumulate), originally referring to a buildup of something causing abdominal spasms. The irritation sense likely developed from the discomfort associated with such spasms.