Parkinson’s syndrome does not cause dementia, Parkinson’s later stages will show symptoms such as intellectual decline and slow reaction, but it is not dementia, but Parkinson’s disease dementia. Parkinson’s syndrome is a clinical syndrome related to motor function, and the main symptoms are tremor, hypokinesia, and balance disorders. Parkinson’s disease dementia is mainly caused by lesions of dopamine neurons in the substantia nigra of the brain. Later stages of Parkinson’s syndrome will show symptoms such as mental decline and slow reaction time, which is called Parkinson’s disease dementia, not Alzheimer’s disease. Therefore Parkinson’s syndrome does not cause Alzheimer’s disease. Alzheimer’s disease, also known as Alzheimer’s disease, is mainly characterized by cognitive dysfunction and other degenerative lesions of the central nervous system, and the common causes are temporal lobe of the brain, hippocampal atrophy and so on. In summary, the two are different diseases caused by different causes, so Parkinson’s syndrome does not cause Alzheimer’s disease.