The number of young-onset Parkinson's disease cases, diagnosed in individuals aged 20 to 49, is on the rise globally, according to recent research. This trend, coupled with a broader understanding of the condition's diverse symptoms, is bringing attention to a form of the disease often overlooked due to its early onset.
Parkinson's disease, a progressive neurological disorder, is typically associated with individuals between 50 and 65. However, up to 7% of Parkinson's patients in the UK, totaling over 11,000 people, have the young-onset form. A study published in the journal npj Parkinson's Disease indicates that cases have more than doubled worldwide between 1990 and 2021. While the exact causes for this increase remain unclear, potential factors include improved detection methods, stronger genetic predispositions in younger populations, and increased exposure to environmental toxins like pesticides.
Parkinson's disease results from the buildup of misfolded proteins in the brain, leading to the destruction of dopamine-producing cells. Dopamine is crucial for controlling movement, as well as regulating mood and motivation. A deficiency in dopamine can lead to slow or jerky movements, as well as decreased mood and energy levels.
Diverse Symptoms of Parkinson's
While tremors and muscle stiffness are commonly associated with Parkinson's, the condition can manifest with over 40 potential symptoms. These can include apathy, anxiety, depression, muscle cramping, sleep disturbances, dizziness, involuntary movements (dyskinesia), and the sensation of freezing, where a person is unable to move. Loss of smell and constipation can also be early indicators.
In young-onset Parkinson's, certain symptoms may be more prominent. Dr. James Gratwicke, a consultant neurologist, notes that dystonia—abnormal muscle contractions causing severe cramping—is a frequent early sign in younger patients. Psychiatric symptoms such as apathy, anxiety, and depression are also more likely, as dopamine plays a role in emotional regulation and behavior circuits. Unlike older individuals, younger patients are less likely to experience balance problems initially.
Shafaq Ali, a 47-year-old dentist, experienced a decade of unexplained symptoms before receiving a Parkinson's diagnosis at age 41. Her initial issues began in her 30s with throbbing pain in her right foot and later her arm, which she attributed to her profession's repetitive movements. She also suffered from extreme fatigue and heightened anxiety. It was not until her husband suggested she inquire about young-onset Parkinson's that her symptoms were systematically investigated.
Changes in handwriting, such as becoming smaller and slanting, are a recognized symptom reflecting reduced fine motor control, as explained by Dr. Gratwicke. Ali noted her handwriting had deteriorated, and by age 39, she struggled with tasks requiring fine motor skills like using a computer mouse or buttoning clothes. A slight tremor in her right arm, initially unnoticed by her doctors due to her youth, was also present.
Diagnosis and Management
Ali's husband was instrumental in connecting her varied symptoms—tremors, muscle pain, falls, slowed movement, and sleep issues—to Parkinson's. A referral to a neurologist led to a diagnosis confirmed by a DaTscan, which detects dopamine deficiencies in the brain.
Beyond aging, other risk factors for Parkinson's include exposure to pesticides, air pollution, and traffic noise, according to Simon Stott, director of the Cure Parkinson's charity. A Danish study involving three million people found a correlation between long-term exposure to traffic noise and an increased risk of the condition.
Stott highlighted that young-onset Parkinson's is often missed because healthcare providers may not consider it in younger patients. The lack of a definitive biological test, such as a blood test, means diagnosis relies on clinical assessment by a neurologist, often after other possibilities have been explored.
Upon diagnosis, Ali was prescribed levodopa, a dopamine replacement therapy. While initially highly effective, controlling her tremor and restoring energy, its efficacy diminished over time, requiring higher doses and eventually slow-release formulations. Younger patients may also be prescribed dopamine agonists, which offer longer-lasting effects and potentially fewer side effects like impulse control disorders.
Ali had to leave her career as a dentist due to her symptoms, a decision that deeply affected her. Despite ongoing challenges, including persistent foot pain and limited symptom control from medication, she remains proactive.
Research continues into potential treatments to halt the disease's progression. Ambroxol, a cough medicine, is being investigated for its potential to slow disease progression by aiding in the clearance of waste products in brain cells. Clinical trial results are anticipated next year.
Exercise is also recognized as beneficial. Studies suggest that regular aerobic exercise can slow disease progression. Ali incorporates Pilates, Kung Fu, physical therapy, and walking into her routine and actively participates in clinical trials, advocating for a cure. Her message emphasizes that age should not be a barrier to considering Parkinson's as a diagnosis.