spasms

n. sudden involuntary contraction of a muscle or muscles, convulsion, cramp; sudden outburst of intense activity

A spasm is a sudden, involuntary contraction of a muscle, a group of muscles, or a hollow organ, or a similarly sudden contraction of an orifice. It is sometimes accompanied by a sudden burst of pain, but is usually harmless and ceases after a few minutes. Spasmodic muscle contraction may also be due to a large number of medical conditions, however, including the dystonias.
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Spasm 1. a sudden, violent, involuntary muscular contraction. 2. a sudden transitory constriction of a passage, canal, or orifice. [more]Spasms - Community and Resources

Noun
1. a painful and involuntary muscular contraction
(synonym) cramp, muscle spasm
(hypernym) symptom
(hyponym) charley horse, charley-horse
2. (pathology) sudden constriction of a hollow organ (as a blood vessel)
(hypernym) constriction
(hyponym) bronchospasm
(classification) pathology

SPASMI. ACCESSI. ATTACCHI