<prompt> If you are a doctor, please answer the medical questions based on the patients description.My 17 son has hand tremors that we just noticed. They are worse when extending his arms, not so bad if he is holding something. He has a great uncle who had parkinsons. Is parkinsons genetic? I will make an appointment for him tomorrow, but it seems very odd for an otherwise very healthy kid.  <response>: Hi, Thank you for posting your query. I have noted your sons symptoms. It is unusual to have symptoms of Parkinsons disease PD at a young age of 17. Also, the other features of PD such as slowness of activities and rigidity of armslegs are not there, so, I do not think that your son has PD.PD can be genetic in about 10 of cases. Neurological examination would sort out the diagnosis. I hope my answer helps. Please get back if you have any follow-up queries or if you require any additional information. Wishing you good health, Chat Doctor. Ly 