The incidence of young-onset Parkinson's disease, affecting individuals under 50, is on the rise globally, with recent research indicating cases have more than doubled between 1990 and 2021. This trend is prompting a closer look at potential contributing factors beyond aging, the primary risk factor for the condition.
Parkinson's disease is a progressive neurological disorder caused by the destruction of dopamine-producing brain cells. Dopamine is a chemical transmitter crucial for controlling movement, as well as regulating mood and motivation. A lack of dopamine can lead to slow and jerky movements, along with decreased mood and energy. While typically diagnosed in individuals between 50 and 65, an estimated 10 to 20 percent of Parkinson's diagnoses in the U.S. occur in those under 50, with about half of these cases diagnosed before age 40.
Shafaq Ali, a 47-year-old dentist, was diagnosed with Parkinson's at age 41 after a decade of experiencing symptoms. Initially, she attributed her issues, such as tripping, foot pain, extreme fatigue, and anxiety, to her demanding life as a busy mother and professional. Her symptoms began in her 30s with throbbing pain in her right foot and arm, muscle cramping, and difficulty with fine motor skills, including writing and using a computer mouse. These early signs were often dismissed or misattributed to overuse or minor injuries.
"My leg would randomly give way and suddenly I'd be on the floor," Ali recounted. "I put it down to overuse again, as I'm a dentist and used my right arm all the time."
Changes in handwriting, characterized by smaller and slanting script, are a common, though often overlooked, symptom. Ali's husband was instrumental in connecting her varied symptoms, prompting a doctor's visit and subsequent referral to a neurologist. A DaTscan confirmed the diagnosis by revealing a dopamine deficiency.
Experts are investigating several theories for the rise in young-onset Parkinson's. These include improved detection methods, a stronger genetic component in younger patient groups, and increased exposure to environmental toxins such as pesticides and air pollution. A study published in JAMA Neurology suggested a link between long-term exposure to traffic noise and a higher risk of developing the condition.
Dr. James Gratwicke, a consultant neurologist, noted that younger patients often present with different initial symptoms. "One of the very common symptoms in younger people is dystonia (abnormal contraction of muscles) – muscles tense up and cramp badly and this will very often be one of the first symptoms," he said. "There is also a higher likelihood in younger people of psychiatric symptoms caused by the Parkinson's, such as apathy, anxiety and depression."
Treatment for Parkinson's typically involves medication to manage symptoms. Ali was prescribed levodopa, a dopamine replacement therapy. While initially effective, the medication's efficacy diminished over time, requiring higher doses. The progression of her symptoms eventually led her to give up her career as a dentist, a decision she described as devastating.
"My job was my vocation and whole identity – it was devastating for me," Ali said.
Despite the challenges, ongoing research offers hope. Potential treatments, such as ambroxol, a cough medicine being investigated for its ability to slow disease progression, are in clinical trials. Exercise, including walking, cycling, and swimming, is also recognized as beneficial. Ali remains active in patient advocacy and participates in clinical trials, emphasizing the importance of awareness for all age groups.
"My message is, just because you are young doesn't mean you can't get Parkinson's," she stated.