Parkinson's Disease: Symptoms, Causes, and Management

Overview

Parkinson's disease (PD) is a progressive neurodegenerative disorder caused by the loss of dopamine-producing neurons in the substantia nigra. It primarily affects movement but also involves a wide range of non-motor symptoms.

Motor Symptoms

• Resting Tremor: Typically starts unilaterally in hands ("pill-rolling").
• Bradykinesia: Slowness of movement; reduced spontaneous motion.
• Rigidity: Increased muscle tone (cogwheel or lead-pipe).
• Postural Instability: Impaired balance and coordination; falls in later stages.
• Speech Changes: Hypophonia (soft voice), monotone, slurring.
• Dysphagia: Difficulty swallowing; risk of aspiration.

Non-Motor Symptoms

• Depression, anxiety, apathy
• Sleep disorders (REM behavior disorder, insomnia, excessive daytime sleepiness)
• Fatigue
• Cognitive impairment (mild cognitive impairment to dementia)
• Autonomic dysfunction: constipation, orthostatic hypotension, urinary urgency
• Sensory: hyposmia (reduced smell), pain

Management

While incurable, PD is manageable with a multidisciplinary approach:

• Medications: Levodopa/carbidopa (gold standard), dopamine agonists, MAO-B inhibitors, COMT inhibitors, amantadine.
• Deep Brain Stimulation (DBS): For motor fluctuations and dyskinesias refractory to meds.
• Therapies: Physical, occupational, speech/swallowing therapy.
• Lifestyle: Exercise (especially aerobic and resistance), balanced nutrition, fall prevention.
• Support: Counseling, support groups, advance care planning.

Early diagnosis and tailored treatment optimize quality of life and functional independence.