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Do you sweat more. Do you have any other health problem like loss of weight recently, disturbed sleep, loose stools. There are number of causes but commonly you must exclude Hyperthyroidism
(Do Thyroid hormone check), Benign essential tremor
(Usually along with head nodding present), medication like Inderal, steroid hormone medication, early onset Parkinsonism
. Kindly visit the Neurologist
who will provide you with right management.