全身筋肉痛だ。

English Translation

My whole body is sore.

筋肉痛 (きんにくつう) is a one word so as 頭痛 (ずつう; headache) and 腹痛 (ふくつう; stomachache) are. Don’t split the word into 筋肉 + {{痛}}.

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