For patients with Parkinson's disease, the clinical symptoms are mainly divided into two categories: motor symptoms and non-motor symptoms.

Among the non-motor symptoms, dysfunctions in autonomic nervous regulation can manifest as orthostatic hypotension, which generally occurs in the middle to late stages of Parkinson's disease. The main manifestation is a continuous drop in systolic blood pressure by more than 30mmHg, or diastolic blood pressure by more than 15mmHg within three minutes of the patient moving from a lying or sitting position to a standing position. This can lead to general fatigue, dizziness or light-headedness, slow thinking, and even fainting. Therefore, when patients with Parkinson’s disease experience dizziness, it is important to consider the possibility of orthostatic hypotension.