There are many possible causes for tremor on various locations in the body.
Calcium is not the only electrolyte whose disturbance can cause spasms and tremor. Lack of magnesium in the blood called hypomagnesemia can also cause tremor. Other symptoms of hypomagnesemia include: weakness, muscle cramps, cardiac arrhythmia, increased irritability of the nervous system. In some people nystagmus and an extensor plantar reflex can be found. In more severe cases mental symptoms like: confusion, disorientation, depression and hallucinations might be present.
You might want to have a laboratory test for magnesium level in the blood. Taking nutritional supplements with magnesium for longer period (at least several weeks) might improve the condition. If the condition is not improved then you might want to consult with your doctor to find out what causes the low levels of magnesium on the blood.
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