doctors are studying the exact causes of parkinson's. it is said that parkinson's develops through a combination of genetic errors and several possible influences, but not much is known. doctors have discovered some clues about the cause(s). it is caused by the destruction of specialised ganglions in the brain. the production of dopamine, a neurotransmitter, reduces. parkinson's can also be genetic. but research shows that genetic parkinson's is not normal, and is uncommon. parkinson's disease is more frequent among those who work with pesticides or have had a history of head injuries.