Spasm

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

For other uses, see Spasm (disambiguation).
"Spasmodic" redirects here. For the British literary movement, see Spasmodic poets.
Not to be confused with Cramp or Seizure.
Muscle spasm
SpecialtyNeurology

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".

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