What is a Muscle Spasm?
Muscle spasms, usually temporary, are excessive contractions of muscle caused by an accumulation of lactic acid. However a hypertonic spasm caused by malfunctioning feedback nerves is more serious, and can be permanent.
How Does it Develop?
When a muscle contracts, blood flow decreases. This produces lactic acid which builds up in the muscle. When it accumulates, it can become toxic. The signal to the brain becomes weaker, so the brain reads this as... the muscle is relaxing, and tells the muscle to tighten up even more... and the vicious cycle begins.