Parkinson Disease Juvenile Autosomal Dominant (PDJAD) is a rare type of Parkinson's disease that typically manifests in individuals under the age of 25. It is characterized by the progressive degeneration of nerve cells in the brain, resulting in symptoms such as tremors, muscle rigidity, and impaired balance. While there are no direct synonyms for the specific term "Parkinson Disease Juvenile Autosomal Dominant", it is commonly referred to as "Juvenile Parkinson's disease" or "Early-Onset Parkinson's disease". These terms convey the same meaning, indicating the onset of Parkinson's disease at an early age and the dominant inheritance pattern within families.