Spasm

Muscle spasm
Muscle spasm
Other names	Charley horse, Cramp, or twitch.
Pronunciation	[MUS] + [UHL SPAZ] + [UHM] ;
Specialty	Neurology
Duration	Seconds to 15 minutes or longer.
Causes	Inadequate diet, physical overexertion, and tight/inflexible muscles

A spasm is a sudden involuntary contraction of a muscle,^[2] a group of muscles, or a hollow organ, such as the bladder.

A spasmodic muscle contraction may be caused by many medical conditions, including dystonia. Most commonly, it is a muscle cramp which is accompanied by a sudden burst of pain. A muscle cramp is usually harmless and ceases after a few minutes. It is typically caused by ion imbalance or muscle overload.

There are other causes of involuntary muscle contractions, and some of these may cause a health problem.

A series of spasms, or permanent spasms, is referred to as a "spasmism".

[1] ttps://www.betterhealth.vic.gov.au/health/conditionsandtreatments/muscle-cramp#risk-factors-for-muscle-cramp

[2] Dorland's medical reference works.

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