What Is Parkinson’s Disease?
Parkinson’s disease (PD) is a progressive neurological disorder that affects movement, balance, and coordination. It occurs when nerve cells in the brain, particularly in the substantia nigra, lose their ability to produce dopamine, a neurotransmitter responsible for smooth and controlled muscle movements.
More than 10 million people worldwide live with Parkinson’s disease, according to the Parkinson’s Foundation. While symptoms typically develop gradually, the disease can significantly impact daily activities and overall quality of life. Although there is currently no cure, ongoing clinical research is bringing new hope through innovative treatments aimed at slowing progression and improving symptom management.
At BioResearch Partner, we are dedicated to advancing Parkinson’s disease research to help patients, families, and the medical community discover better solutions for living with PD.
Symptoms of Parkinson’s Disease
Symptoms can vary from person to person, and they often begin subtly before becoming more noticeable. The primary symptoms include:
- Tremors or shaking, especially in the hands, arms, or legs
- Muscle stiffness or rigidity
- Slowed movements (bradykinesia)
- Balance problems or difficulty walking
- Changes in handwriting or facial expression
- Speech or swallowing difficulties
- Fatigue and reduced coordination
Non-motor symptoms such as depression, sleep disturbances, anxiety, constipation, and cognitive decline can also occur as the disease progresses.
Stages of Parkinson’s Disease
Parkinson’s disease develops gradually through several stages:
- Stage 1: Mild symptoms, typically on one side of the body only.
- Stage 2: Symptoms become bilateral but do not affect balance.
- Stage 3: Balance impairment begins; falls may occur.
- Stage 4: Symptoms are severe, and assistance with daily activities is needed.
- Stage 5: The most advanced stage, often requiring full-time care.
Understanding these stages allows clinicians and researchers to better tailor therapies for each patient’s unique condition and progression.
- Stage 1: Mild symptoms, typically on one side of the body only.