Twitching finger can occur secondary to benign muscle spasms, dietary deficiencies, or electrolyte imbalance.
Nutritional deficiencies can alter electrolyte levels, which might cause twitching fingers.
Calcium, magnesium or potassium levels that are below normal often produce twitching or muscle cramps. Diets low in calcium or high in carbonated soda consumption can contribute to abnormally low blood calcium levels and subsequent muscle twitching. Carbonated soda may also deplete magnesium levels.
Involuntary twitching might also be a symptom of nerve injury or compression in it's path.
Other possible cause may include benign fasciculation syndrome might begin with twitching fingers, involuntary muscle spasms of the eyelids, limbs, or face. The spasms may occur intermittently or continuously and generally cease upon purposeful movement of the affected area.
So you should see your doctor for a clinical examination and if required complete blood work,NCV with EMG should be done.
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