痙る[tsuru] to cramp
痙攣[keiren] convulsion
胃痙攣[ikeiren] stomach cramps
書痙[shokei] writer's cramp
抗痙攣薬[koukeirenyaku] anticonvulsant

足が痙る[ashigatsuru] to have one's leg cramp
膣痙攣[chitsukeiren] vaginismus
咬痙[koukei] lockjaw
鎮痙薬[chinkeiyaku] antispasmodic drug
鎮痙剤[chinkeizai] antispasmodic drug