JLPT N2
せいか
Perhaps because of...
Structure
Noun + のせいか / Verb plain form + せいか / い-adj + せいか / な-adj + なせいか
How it works
～せいか is used to express a possible reason for a situation, often when the speaker is not entirely sure about the cause. It suggests a causal link but without definitive certainty.
Examples
昨夜あまり寝なかったせいか、今日は頭が痛い。
Perhaps because I didn't sleep much last night, I have a headache today.
Common mistakes
Confusing it with ～おかげで (thanks to) which implies a positive outcome, or ～せいで which implies definite blame.
Tip
Remember 'せい' (responsibility/fault) suggests a cause, and 'か' (question particle) suggests uncertainty.
More JLPT N2 grammar
See せいか in real Japanese
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