hello welcome to healthcaremagic
shaking of hands can be either tremors or seizures.
i would need a little more history to reach a presumptive diagnosis.
1.does he have palpitations/tachycardia/dyspnoea during the episode of shaking.. if yes then this can be a tremor and it can be due to
hypoglycemia.
now since he is diabetic(and you mentioned he is controlled on diet) i would still like to enquire history of metformin intake for diabetes. as metformin in
heart failure patients can cause hypoglycemia. in such a case please see his physician because he needs to change his medicines.
2. does he has
loss of consciousness, losss of bowel/bladder control, tongue biting/frothing from mouth during this shaking attack. if yes then this could be a GTCS seizure or a
partial seizure. in this case i would advice you to follow up with a nearby doctor immediately as he need medications for this.
3. it could be asterexis due to
hepatic encephalopathy. his LFT needs to be done in this case.
for symptomatic relief please give him some sugar next time he experiences such attack.
i hope this helps you.
please feel free to revert back in case of any doubts/concerns
thank you.