It’s both, but it starts in the brain. Parkinson’s is a progressive brain disorder that affects how the nervous system works, which is why its symptoms can show up throughout the body, not just in movement.
A Brain or Nervous System Disorder?
The Parkinson's experience
What Parkinson’s Is: In Plain Terms
Parkinson’s Disease: From Brain Changes to Body Effects
From Brain to Body
Parkinson’s Disease is a neurodegenerative disorder that affects movement and many other body systems. Its most recognizable effects occur in the brain, where changes in Dopamine-producing nerve cells affect the brain’s ability to coordinate movement. Research is still ongoing to better understand where and how the disease process begins.
Parkinson’s develops as nerve cells that produce Dopamine, a chemical messenger called a neurotransmitter that helps movements stay smooth and coordinated, gradually slow down and stop functioning over time.
As Dopamine levels decline, communication between the brain and body becomes less efficient and less reliable. This can affect movement, balance, speech, and automatic body functions such as sleep, digestion, and blood pressure.
Although Dopamine loss is the most well-known feature of Parkinson’s, other brain systems and neurotransmitters can also be affected as the disease progresses. This helps explain why Parkinson’s can affect many aspects of health beyond movement.
One way to picture Parkinson’s is to imagine a small neighborhood power substation sending steady electricity to a house at the end of the line. When everything is working normally, power flows smoothly and the house receives a consistent signal.
When Parkinson’s interferes, that substation begins to misfire, and the signal reaching the house becomes weaker and less reliable. The connection is still there, but it becomes harder for the system to send clear, consistent instructions.
It is not a total blackout. It is more like trying to function with only one bar of signal.
Over time, as Dopamine-producing cells continue to decline, these signals can become even less consistent, which is why symptoms may gradually change.
Another way neurologists sometimes describe this is to think of Dopamine like part of the brain’s movement “volume control system.” When Dopamine is working normally, movements are properly regulated and coordinated. As Dopamine declines, the brain has a harder time adjusting that control, which can lead to movements becoming slower, stiffer, or harder to start.
Because many Parkinson’s symptoms are linked to reduced Dopamine signaling, most treatments focus on helping restore or support Dopamine signaling to improve movement-related symptoms.
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Fun Details
A few questions that often come Up
When a doctor uses the term Parkinsonism, they’re describing a group of conditions that can cause Parkinson-like movement symptoms. It’s a broad category, not a single diagnosis. Health care providers often use the term when someone has overlapping motor symptoms such as slowness, stiffness, tremor, and balance changes, even before the exact cause is confirmed.
Think of it like a “category label,” not the final answer, more “we’re seeing a pattern” than “case closed.”
Parkinsonism is a starting point, not the finish line. It helps doctors narrow down what’s causing the symptoms.
“During a recent medical exam, my doctor said I’m showing Parkinsonism-like symptoms, what does that
actually mean?”
Parkinson’s often follows a familiar pattern. It can affect movement, but it can also affect things like sleep, energy, digestion, and mood. Over time, as Dopamine-producing nerve cells continue to decline or stop functioning, communication between the brain and body becomes less consistent. That change in signaling is one reason symptoms may gradually evolve.
Parkinson’s Disease, on the other hand, is a specific diagnosis.
Parkinsonism describes what doctors see, a group of movement symptoms such as slowness, stiffness, tremor, or changes in balance. It’s a way of naming the pattern of symptoms without yet explaining why they’re happening.
Parkinson’s Disease explains why those symptoms are happening. It’s a specific medical diagnosis caused by the gradual loss of Dopamine-producing cells in the brain, which affects how the brain and body communicate over time.
Parkinsonism vs. Parkinson’s: Symptoms Versus the Underlying Cause
About 1 in 10 people with Parkinson’s are diagnosed before age 50
Parkinson’s Under 50
More than 10 million people worldwide (and growing) are living with PD.
Impacts Millions
Parkinson’s is currently considered the fastest-growing neurological disorder in the world.
Fast Growing
To understand why this happens, it helps to understand basics pertaining to about proteins.
Proteins are essential building blocks inside our cells. They fold into very specific three-dimensional shapes — and that shape determines what they do. A protein begins as a long chain of amino acids (think beads on a string), but it can’t function in that straight-line form. It must fold properly to work correctly.
In Parkinson’s, certain proteins have been found to mis-fold. When proteins mis-fold, they may:
- Clump together
- Lose their normal function
- Interfere with healthy cells
That’s why protein folding is critically important. It plays a direct role in how neurodegenerative diseases develop and progress.
The Role of Proteins in Parkinson’s
Clear answers for a complicated condition.
Lewy bodies (a.k.a. the “uninvited houseguests”).
Lewy bodies are clumps of a mis-folded protein that build up inside brain cells. They don’t belong there, and once they show up, they tend to stick around.
Scientists believe Lewy bodies play an important role in Parkinson’s. Over time, they can spread to different areas of the brain and interfere with how brain cells work. That disruption can lead to both movement and non-movement symptoms.
Think of them like an uninvited houseguest, showing up unexpectedly and making themselves way too comfortable.
Parkinson's Jargon Decoded
Alpha-Synuclein (the main troublemaker inside Lewy Bodies).
No lab coat. Just clarity.
Altered Mitochondria (the “power plants” running low on efficiency).
Mitochondria act as the cell’s energy producers, converting nutrients into usable power. When this process breaks down, cells are left without the energy they need, even for basic functions.
It’s like trying to run a city on rolling brownouts, except no one’s in charge, the outages aren’t scheduled, and critical systems don’t always get priority.
In Parkinson’s, Mitochondrial dysfunction is often seen in affected brain cells. Over time, this can leave neurons underpowered, overstressed, and more likely to malfunction or break down.
Alpha-Synuclein is a protein that normally helps brain cells communicate and handle Neurotransmitters. In Parkinson’s, it can misfold into abnormal shapes that the brain can’t clear away effectively. Instead of being recycled, these misfolded proteins can clump together, more like a wad of gum stuck under a table than something the cell can easily clean up.
Over time, these clumps disrupt normal cell function, put stress on neurons, and may contribute to cell damage and cell death.
Because Alpha-Synuclein is a core component of Lewy Bodies, and may be detectable in spinal fluid before symptoms appear, it has become a major focus of Parkinson’s research for earlier diagnosis and potential treatments.
Why Shape matters?
To understand why this happens, it helps to understand a few basics about proteins.
Proteins are essential building blocks inside our cells. They fold into very specific three-dimensional shapes, and that shape determines what they do. A protein begins as a long chain of Amino Acids (think beads on a string), but it can’t function in that straight-line form. It must fold properly to work correctly.
In Parkinson’s, certain proteins have been found to mis-fold. When proteins mis-fold, they may:
- Clump together
- Lose their normal function
- Interfere with healthy cells
That’s why protein folding is critically important. It plays a direct role in how neurodegenerative diseases develop and progress.
The Role of Proteins in Parkinson’s
Why Shape Matters
