Spasm

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. A spasm is usually accompanied by a sudden burst of pain. Spasmodic muscle contraction may be due to a large number of medical conditions, including the dystonias.

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By extension, a spasm is also a sudden and temporary burst of energy, activity, or emotion.

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A subtype of spasms is colic, an episodic pain due to spasms of smooth muscle in a particular organ (e.g. the bile duct). A characteristic of colic is the sensation of having to move about, and the pain may induce nausea or vomiting if severe.

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Muscle: Muscle is a contractile form of tissue. It is one of the four major tissue types, the other three being epithelium, connective tissue and nervous tissue. Muscle contraction is used to move parts of the body, as well as to move substances within the body....

Organ: An organ is the following:...

Contraction: Contraction can mean:...