Welcome to HealthcareMagic forum,
Involuntary shaking also referred to as tremors are associated with multiple medical condition. Medical drugs, parkinson's diease, thyroid
problems and nutritional deficiencies are few of the commonest reasons.
A thorough neurological examination and review of medical drugs (if any) will help us to narrow the possibilities.
It might cause some concern and can be treated with proper medications depending on the cause. Hence I encourage you to consult your local physician for evaluation and treatment.
Hope this answers your query.
Wish you good health.