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What would cause a muscle to twitch?

A muscle twitch is usually caused by an imbalance or lack of the essential nutrients needed to create a muscular contraction. If you have a lack of electrolytes or calcium this can cause a muscle twitch to occur or it can also be caused by dehydration which affects muscle contraction ability. If you experience a constant or frequent muscle twitch consult your physician to make sure it’s not being caused by some underlying medical condition.
There are a variety of reasons one’s muscles would twitch including but not limited to tiredness, disorders of the spine or the discs within the spine, stroke, and Lou Gehrig’s disease (amyotrophic lateral sclerosis). Muscle twitching can be caused by something simple such as dehydration to a complicated cause like spinal muscular atrophy. It can also be due to medications and electrolyte imbalances within the body. People with tic disorders may twitch, but those who are healthy individuals may also have twitching which is completely normal and does not signify a disease or problem.
Muscle twitching is caused by minor muscle contractions or uncontrollable twitching of a muscle group that is served by a single motor nerve fiber. A deficiency in the diet may cause a muscle to twitch. An overdose of a drug such as caffeine may also cause a muscle to twitch. Muscle twitching may also be a side effect of a drug. Exercise may also cause a muscle to twitch. Benign twitches may often affect the eyelids, calf, or thumb. These are normal and quite common and often triggered by stress or anxiety.  They come and go and do not last for more than a few days.  

Disorders that may cause muscle twitches include amyotrophic lateral sclerosis (ALS - Lou Gehrig's disease), damage to the nerve that leads to a muscle, muscular dystrophy, and spinal muscular atrophy.  

See your doctor if you experience long-term or persistent twitches.   

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.