せいか

expression

it may be because; perhaps because

Expresses a tentative reason or cause, often with a sense of uncertainty or speculation. Commonly used in casual speech and writing.

• 彼かれが遅おくれたのは、電でん車しゃが遅おくれたせいか。

  Perhaps he was late because the train was delayed.

• 最さい近きん疲つかれやすいのは、年としのせいか。

  Maybe I get tired easily lately because of my age.