Muscle Spasms »
What is a muscle spasm?
A muscle spasm or cramp is an involuntary contraction of a muscle. Muscle
spasms occur suddenly, usually resolve quickly, and are often painful.
A muscle spasm is different than a muscle twitch. A muscle twitch or
fasciculation is uncontrolled fine movement of a small segment of a larger
muscle that can be seen under the skin.
Muscles are complex structures that cause movement in the body. There are
three types of muscle in the body:
- heart muscle that pumps blood (cardiac muscle)
- skeletal muscle that moves the external body parts
- smooth muscle that move portions of hollow structures inside the body
Skeletal muscles are anchored to bone, either directly or by a tendon. When
the muscle contracts, the associated structure moves. This allows arms to lift,
legs to run, and the face to smile. Most of these muscles are under willful or
conscious control of the brain. Thi...
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