Hi there..  tremor is an unintentional and uncontrollable rhythmic movement of one part or one limb of your body.. could be any part of body.. usually hands affected more.. causes include excess stress, fear,worry,, drug induced, excess alcohol intake or alcohol withdrawal, excess caffeine intake, smoking, thyroid problem, certain medications like asthma medications,, diseases like multiple sclerosis, Huntington's chorea, Parkinson's disease( al these seen in elderly) another common cause of tremors is essential tremors.. Treatment includes lifestyle changes, relaxation exercises, tablet propranolol 10mg.. please consult physician once...