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- Muscle spasm facts
- What are the different types of muscle?
- What is skeletal muscle?
- What is smooth muscle?
- What is a muscle spasm?
- What causes muscle spasms?
- What causes muscle spasms? (Part 2)
- What causes muscle spasms? (Part 3)
- What are the symptoms and signs of muscle spasms?
- How are muscle spasms diagnosed?
- How are muscle spasms treated?
What causes muscle spasms? (Part 3)
Dystonias are movement disorders where groups of muscles forcefully contract and cause twisting. Uncontrolled repetitive movements and the inability to maintain normal posture may be the result of this type of muscle spasm and cramping. The symptoms may be mild initially but gradually progress to become more frequent and aggressive. Occasionally, there is no progression. Examples of this type of muscle spasm include torticollis (where the neck muscles spasm and cause the head to turn to one side), blepharospasm (where there is uncontrolled blinking of the eyes), and laryngeal dystonia that affects the muscles that control speech.
Dystonias may be caused by abnormally functioning neurotransmitter chemicals within part of the brain called the basal ganglia. These chemicals (serotonin, dopamine, acetylcholine, and GABA) are required to properly send messages between brain cells that begin muscle contraction. Dystonia symptoms may occur as a complication of stroke.
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