My sister' s right hand shivers when she does any kind of work. It has also become weaker. The problem has emerged since last one year or so. Her age is 45+ years. Regular medication also doesn' t help. Please suggest any other treatment or medicines for curing or controlling this problem. I think it is a case of essential tremor, but some docs say its parkinson' s disease. Does parkinson' s disease afflict people before 50 years. Please help with your expertise.