The muscle twitch creates short, involuntary muscle contractions, which affect tiny muscle areas that lie beneath the skin.
The euphoric rush is a culmination of nerve stimulation, muscle contractions and brain chemistry. ‘Rhythmic contractions of ...
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Crippling back spasms

Medically reviewed by Mallory Christopherson, DC Key Takeaways Back spasms are involuntary muscle contractions. They can ...