Most Parkinson’s sites organize symptoms into two, sometimes three, broad categories. That framework is a helpful starting point. At BetterChance Alliance, we don’t stop there.
Parkinson’s doesn’t follow neat boundaries. Symptoms overlap, evolve over time, and show up differently in each person. It often colors outside the lines.
That’s why BetterChance Alliance's approach is to explain how symptoms truly unfold in lived experience: connected, evolving, and deeply personal.
Parkinson's Disease (PD) — Symptoms Categories Approach
1. Core Movement Symptoms
Bradykinesia (Slowed Movement) - A defining indicator of Parkinson’s and required for diagnosis. Bradykinesia means movement is slow and hard to start or keep going. It is not a loss of strength. People often describe feeling slowed, stiff, or briefly :stuck.
Resting Tremor - Movement when the body is still. A rhythmic shaking that occurs when muscles are relaxed, most commonly affecting a hand, fingers, or leg. Occurs in approximately 70–80% of people with Parkinson’s, not a required for a Parkinson’s diagnosis. Note: This differs from essential tremor, which typically appears during movement rather than at rest.
Stride/Walking Gait Changes (Postural Instability) - Balance and walking are affected as coordination between posture and movement weakens. Stooped or forward-leaning posture, short, shuffling steps. Reduced or absent arm swing (Akinesia), difficulty turning or changing direction.
Brief moments of freezing, where the feet feel momentarily glued to the floor (Freezing of Gait).
Loss of automatic movements: Reduced ability to perform natural, unconscious actions such as blinking, smiling, or arm swing while walking.
2. Secondary Movement Symptoms
Speech changes: Speech may become softer (Hypophonia), slurred or poorly articulated (Dysarthria), rushed (Tachyphemia), and sound flat or monotone with reduced pitch and rhythm (Monoprosody).
Small or cramped handwriting (Micrographia)
Mask-like facial expressions changing very little or not at all. (Hypomimia)
Difficulty swallowing due to reduced throat muscle control (Dysphagia)
Drooling (due to reduced swallowing loss of facial muscle control, not excess saliva) (Sialorrhea)
Movement (Motor) Symptoms
We start the way most Parkinson's resource groups do, by organizing symptoms into three main groups: Core Movement, Secondary Movement, and Non-Movement.
But rather than leaving everything else in one broad category, where important details can easily get lost, we further break Non-Movement symptoms into four clearer areas:
Core Autonomic Functions, Sensory/Autonomic, Cognition, and Emotional/Mood.
This approach organizes symptoms into connected patterns, mirroring daily experiences and making them easier to notice, understand, and disscuss.
• Depression and anxiety
• Apathy (reduced motivation)
• Irritability
• Emotional fatigue
• Stress sensitivity
• Impulse-control symptoms (sometimes medication-related
These symptoms reflect brain chemistry changes, not personality or attitude.
Emotional/Mood
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Cognitive Indicators
• Slower processing speed
• Difficulty multitasking
• Trouble with concentration and focus
• Word-finding difficulty
• Executive function
changes (planning,
organizing, sequencing)
Note: Changes in thinking and processing, not emotional, not movement
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Sensory Autonomic
• Temperature and sweating regulation issues
• Pain sensitivity changes
• Tingling or discomfort without injury
• Sleep disorders, including:
- REM sleep behavior disorder (acting out dreams)
- Restless legs syndrome
- Periodic limb movement disorder (PLMD)
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Core Autonomic
-Blood pressure regulation issues (Orthostatic Hypotension: dizziness when standing)
• Digestive changes
(constipation, slowed gut movement)
• Bladder changes (urinary urgency or incontinence)
• Temperature and sweating regulation issues
• Sexual function changes
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Research increasingly suggests that these symptoms can show up early on, even years before the more familiar movement symptoms begin.
Subcategorized t0 mAke them easier to recognize,
Non-Movement Symptoms
Commonly recognized risk factors include age, genetics, gender and certain environmental exposures.
Next, we take a slightly deeper look at what researchers understand about each, and what those factors may mean over time.
What Are The Risk Factors of Developing PD?
you might be wondering...
Parkinson’s Disease develops differently from person-to-person, and it doesn’t follow one single pattern. Some people notice gradual changes over time, while others experience symptoms in a different order or at a different pace.
While certain factors can increase the likelihood of developing Parkinson’s, having one or more of these does not mean someone will develop the disease, it simply means the odds may be slightly higher. Risk factors can offer helpful clues, but they are not a prediction.
Age
Risk increases with age. Parkinson’s most often begins after age 50, with the average age of onset between 60-70. It can occur earlier, but this is uncommon. When symptoms begin before age 50, it is referred to as early-onset Parkinson’s Disease.
Genetics
Having a first-degree relative (such as a parent or sibling) with Parkinson’s does increase risk, but the overall likelihood remains low unless multiple family members are affected or a known genetic mutation is present.
Gender
Men are more likely than women to develop Parkinson’s Disease. The reasons for this difference are not fully understood, but the pattern is consistent across large studies.
Environmental Exposures
Long-term exposure to certain environmental toxins — particularly some pesticides and herbicides — has been associated with a slightly increased risk. This does not mean occasional exposure causes Parkinson’s, but some substances have shown consistent patterns that warrant ongoing research.
The Causes of Parkinson's
Parkinson’s Disease is classified based on what is known and, in many cases, what is still being learned during diagnostic assessment. Most cases fall into one of three categories: genetic (hereditary), Idiopathic, or Induced Parkinsonism.
What Causes Parkinson’s Disease?
Most cases of Parkinson’s are classified as Idiopathic, meaning there isn’t one clear, identifiable cause. The word Idiopathic comes from Greek and loosely translates to “a disease of its own.”
Current research suggests Idiopathic Parkinson’s involves abnormal processing of a protein called Alpha-Synuclein (a-Synuclein).
Proteins normally fold into precise shapes so they can function properly. When Alpha-Synuclein folds incorrectly (misfolds), it can build up inside nerve cells, forming clumps called Lewy Bodies. Over time, these clumps disrupt normal cell function and damage neurons, especially Dopamine-producing cells, which are essential for smooth movement and coordination.
What Idiopathic Parkinson's Mean?
Parkinson’s can run in families, but that’s relatively uncommon. Only about 10% of cases are clearly linked to inherited genes. Researchers have identified 7 genes associated with Parkinson’s, including GBA1, LRRK2, PRKN, SNCA, PINK1, PARK7, and VPS35. In some cases, these genetic forms may show slightly different patterns or progression.
Even when a gene variant (mutation) is present in a family DNA chains, not everyone who carries it will develop Parkinson’s. Genes can raise risk, but they don’t guarantee an outcome.
Genetics in Parkinson’s?
Not because it’s something most people will ever encounter, but because rare cases in the 1980s revealed that MPTP, after converting to its toxic form, MPP+, selectively destroys Dopamine-producing neurons, the same cells affected in Parkinson’s Disease. This discovery provided critical insight into the disease’s biology and helped advance research and treatment development.
Why mention MPTP?
• Inflammation or infection
Brain inflammation (Encephalitis) can sometimes lead to Parkinsonism.
• Toxins and poisons
Exposure to substances such as Manganese dust, Carbon Monoxide, welding fumes, or certain pesticides can lead to Parkinsonism symptoms. One rare example is MPTP, a substance once found in illegally manufactured “Synthetic Heroin.” While no environmental exposure has been proven to directly cause Parkinson’s Disease, some remain on researchers’ “strongly suspicious” list.
Other Items Falling Under Induced Parkinsonism?
Possible causes include:
- Medications
Certain psychiatric and neurological medications can cause Parkinson’s-like symptoms. These effects are often reversible if the medication is stopped early, though symptoms may persist for weeks or months.
What Does Induced Parkinsonism Mean?
- Insecticides: Permethrin, β-Hexachlorocyclohexane•
- Herbicides: Paraquat, 2,4-D
- Fungicide: Maneb
- Industrial solvent: Trichloroethylene (used in dry cleaning and degreasing)
- Heavy metals like Manganese
Environmental Factors and PD Risk?
While accidents, falls, or sudden physical or emotional shock do not directly cause Parkinson’s Disease (PD) (in most cases, they can serve as significant triggers. In people who are already vulnerable, these events may accelerate the onset of symptoms or worsen existing ones, acting as a tipping point after years of quiet, preclinical changes in the brain.
Research suggests that major trauma or shock can place added strain on already-compromised Dopamine neurons, increase inflammation, and reduce the brain’s ability to compensate.
Can a bad fall, accident or shock cause PD?
Stress does not directly cause Parkinson’s Disease (in most cases). However, chronic stress can act as a trigger. In someone already vulnerable, because of genetics or other underlying changes it may accelerate symptom onset or temporarily worsen existing symptoms. Think of it less as the cause, and more as the “last straw” after years of quiet, preclinical changes in the brain.
Long-term stress affects the body in real ways. It raises stress hormones (like glucocorticoids), increases inflammation, and may strain Dopamine-producing neurons. Some research suggests that chronic stress can make brain cells more vulnerable over time.
That doesn’t mean stress equals Parkinson’s. But it does mean stress management matters, especially for overall brain health.
Can Stress Cause PD?
Sleep Apnea does not directly cause Parkinson’s. However, growing scientific evidence shows a meaningful connection between untreated Obstructive Sleep Apnea (OSA) and an increased risk of developing Parkinson’s over time.
Research summarized by The American Journal of Managed Care indicates that untreated OSA is associated with roughly a 30–60% higher risk of Parkinson’s compared with people without Sleep Apnea. These findings reflect a moderate, but clinically important increase in risk, not a certainty.
Scientists believe this relationship is driven by repeated drops in oxygen, disrupted sleep, inflammation, and ongoing stress on brain cells - conditions that may accelerate underlying Neurodegenerative changes rather than directly cause the disease.
The encouraging news is that OSA is a modifiable risk factor. Evidence suggests that people who receive effective treatment, most commonly CPAP therapy, show a reduced or no significant increase in Parkinson’s risk. This makes early recognition and treatment of Sleep Apnea an important opportunity for proactive brain health.
Some sleep disorders, including Obstructive Sleep Apnea (OSA) and REM Sleep Behavior Disorder, can be early signs of Parkinson’s, even years before movement-related symptoms appear.
