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GRAMMAR
〜せいか
perhaps because of
Explanation
NOTE

〜せいか expresses uncertain attribution of cause — "perhaps because of". The speaker suspects but is not sure.

疲つかれているせいか、集中しゅうちゅうできない。
Perhaps because I'm tired, I can't concentrate.
Use this to suggest a possible, but not certain, negative reason for a situation.
NOTE

Unlike 〜せいで (direct blame), 〜せいか hedges the cause. Often used for negative or unexpected results.

STRUCTURE
V普
せいか
年としを取とったせいか、物忘ものわすれが多おおくなった。
Toshi o totta sei ka, monowasure ga ooku natta.
Perhaps because of aging, I've been forgetting things more.
昨日きのう飲のみすぎたせいか、頭あたまが痛いたい。
Kinou nomisugita sei ka, atama ga itai.
Perhaps because I drank too much yesterday, my head hurts.
運動うんどうしていないせいか、体力たいりょくが落おちた。
Undou shite inai sei ka, tairyoku ga ochita.
Perhaps because I haven't been exercising, my stamina has dropped.
STRUCTURE
N名修
せいか
天気てんきのせいか、気分きぶんが優すぐれない。
Tenki no sei ka, kibun ga sugurenai.
Perhaps because of the weather, I'm not feeling well.
ストレスのせいか、よく眠ねむれない。
Sutoresu no sei ka, yoku nemurenai.
Perhaps because of stress, I can't sleep well.
花粉かふんのせいか、目めがかゆい。
Kafun no sei ka, me ga kayui.
Perhaps because of pollen, my eyes are itchy.

Practice exercises

1
寝不足ねぶそくのせいか頭あたまが痛いたい。
Perhaps because of lack of sleep, I have a headache.
Answer
せいか
2
運動うんどうしたせいか体からだが軽かるい。
Perhaps because I exercised, my body feels light.
Answer
せいか
3
年としを取とったせいか疲つかれやすくなった。
Perhaps because of aging, I get tired more easily.
Answer
せいか
4
天気てんきのせいか気分きぶんがよくない。
Perhaps because of the weather, I'm not feeling well.
Answer
せいか
5
薬くすりのせいか眠ねむくなった。
Perhaps because of the medicine, I became sleepy.
Answer
せいか
6
風邪かぜのせいか声こえが出でない。
Perhaps because of a cold, I can't speak.
Answer
せいか
7
慢性的まんせいてきなストレスのせいか、免疫力めんえきりょくが低下ていかしているようだ。
Perhaps because of chronic stress, it seems my immune system has weakened.
Answer
せいか
8
今日きょうは寒さむいせいか、眠ねむい。
Perhaps because it's cold today, I'm sleepy.
Answer
せいか
9
天気てんきのせいか、気分きぶんが優すぐれない。
Perhaps because of the weather, I'm not feeling well.
Answer
せいか
10
運動うんどうしていないせいか、体力たいりょくが落おちた気きがする。
Perhaps because I haven't been exercising, I feel like my stamina has dropped.
Answer
せいか
11
季節きせつの変かわり目めのせいか、体調たいちょうが優すぐれない日ひが続つづいている。
Perhaps because of the change of seasons, days of feeling unwell have continued.
Answer
せいか