Shaking of hand is known as tremors. Main causes include: psychogenic tremors, Parkinson’s, essential tremors, cerebellar tremors, drug induced, metabolic tremors, dystonic tremors, Wilson’s disease, fragile x syndrome. Diagnosis for the cause is made by dividing the tremor as physiological or not. if physiological cause may be intake related like excess caffeine, metabolic abnormalities like thyrotoxicosis or liver dysfunction. if non physiological then look for cause as medication intake? if yes remove source. If not, look for psychogenic cause. If not, then look for organic causes like disorder with brain.