Attaches to the て-form of an adjective or verb to express that a feeling or sensation is so strong it can't be helped or controlled ('extremely', 'unbearably'). Common with emotions and physical sensations (sleepy, hungry, worried). ~しょうがない is casual; ~しかたがない is slightly more formal.
[い-adj く-form て / な-adj で / Verb て-form] + しょうがない / しかたがない
試験の結果が気になってしょうがない。
Shiken no kekka ga ki ni natte shou ga nai.
I can't stop worrying about the exam results.
気になって (て-form) + しょうがない = the worry is uncontrollable
今日は暑くてしかたがない。
Kyou wa atsukute shikata ga nai.
It's unbearably hot today.
暑くて (て-form of 暑い) + しかたがない = extreme, can't-help-it heat
新しいゲームがやりたくてしょうがない。
Atarashii geemu ga yaritakute shou ga nai.
I want to play the new game so badly I can't stand it.
やりたくて (て-form of たい) + しょうがない = an overwhelming desire
• Used mainly with spontaneous feelings and sensations, not deliberate actions. • ~しょうがない is conversational; ~しかたがない a touch more formal; ~てたまらない is a near-synonym. • The subject is usually the speaker's own emotion or sensation.
The JLPT rarely asks whether you recognise a pattern — it asks which of several similar patterns fits. These are the ones ~てしょうがない/~てしかたがない is tested against.
Nearly identical in meaning; ~てたまらない stresses that the feeling is barely endurable, while ~てしょうがない simply says it can't be helped.
~てならない is more formal/written and used for spontaneous feelings and thoughts; ~てしょうがない is more everyday and physical.
Study Japanese grammar on LenGaki

Get the Android app
The app adds offline study, home-screen widgets, stroke-order tracing, speaking practice with pronunciation scoring, and an AI tutor that answers questions in context — none of which fits in a browser tab.