Is Parkinson's disease hereditary?

It can be, yes. As a general rule, the younger the age of onset (<45yo is early onset), & the more affected relatives (especially close ones), then the more likely it is genetic & the higher the risk to blood relatives. Average age of pd onset is 58. The older you are @ disease onset, the less likely it is genetically inheritable. Look @ this link for help on genetics: http://www.Ncbi.Nlm.Nih.Gov/books/nbk1223/.
In some cases only. The majority of parkinson’s is sporadic, not hereditary. But scientists have identified gene mutations that are associated with increased risk of developing the disease. These genetic forms of parkinson’s usually cause earlier symptoms, before age 50. Genetic testing is available but not recommended without thorough counseling with a parkinson's specialist and genetic counselor.

Related Questions

How could parkinson disease be prevented?

Parkinson. Despite a good deal of investigation so far there is no known causes of Parkinson's except for those drug induced. So until the source is found the concept of prevention remains remote. Read more...

Are there any treatment that works for parkinson disease?

Surgical? Essentially there are medications and surgery. Surgical treatment would likely consist of deep brain stimulation or dbs but, you should confirm this with a neurologist and a neurosurgeon. Read more...