Inclusion Criteria:  Clinical diagnosis of a Parkinson's disease Inpatient in the Neurological Rehabilitation Center Rosenhügel from 12/2020 till 12/2022 Informed consent form signed  Exclusion Criteria:  General contraindications of fiberoptic endoscopic evaluation of swallowing. Not feasible fiberoptic endoscopic evaluation of swallowing due to anatomical changes. Not feasible fiberoptic endoscopic evaluation of swallowing due to hypersensitivity . Not feasible fiberoptic endoscopic evaluation of swallowing due to incompliance. Pregnancy.