筋きん痙けい攣れん

noun

muscle spasm; cramp

Medical and everyday term for a sudden, involuntary muscle contraction. 筋痙攣 is the formal kanji form, but 筋けいれん or きんけいれん are common in practice.

• 運うん動どう中ちゅうにふくらはぎが筋きんけいれんを起おこした。

  I got a cramp in my calf during exercise.

• 筋きん痙けい攣れんは水すい分ぶん不ぶ足そくや疲ひ労ろうが原げん因いんで起おこることが多おおい。

  Muscle spasms are often caused by dehydration or fatigue.