CAMH Study Links Long COVID to Dopamine Neuron Loss in 5% of Global Population
Updated
Updated · ScienceDaily · Sep 22
CAMH Study Links Long COVID to Dopamine Neuron Loss in 5% of Global Population
2 articles · Updated · ScienceDaily · Sep 22
Summary
PET brain scans found people with long COVID had substantially lower dopamine-neuron markers across all major striatal regions, offering what CAMH researchers called their strongest evidence yet for a biological basis of fatigue and brain fog.
Lower marker levels tracked with specific symptoms: ventral striatum loss with reduced motivation, dorsal putamen loss with slower movement, and caudate putamen loss with memory problems.
The findings build on earlier CAMH work showing elevated brain inflammation in the same dopamine-rich regions, supporting a possible pathway from persistent inflammation to neuron injury.
Long COVID affects about 5% of the global population, including roughly 2 million people in Canada, and still has no evidence-based treatment.
Researchers plan a clinical trial within months to test whether boosting dopamine function can improve memory, motivation and fatigue in long COVID patients.
Are the sudden dopamine drops in long COVID patients a permanent brain injury or just a reversible shadow of lingering inflammation?
Could repurposed Parkinson's drugs be the hidden key to finally curing the exhausting brain fog and fatigue of long COVID?
Long COVID’s Hidden Brain Damage: PET Imaging Uncovers Dopamine System Injury and Sparks New Era in Treatment
Overview
A groundbreaking 2026 study revealed that long COVID causes direct, physical injury to dopamine-releasing neurons in the brain, driven by persistent neuroinflammation and immune system dysfunction. Advanced PET imaging showed significant reductions in dopamine markers across key brain regions, which matched patients’ symptoms like fatigue, slowed movement, and memory problems. This damage is linked to both direct viral invasion and chronic inflammation, which disrupts dopamine production and triggers a harmful cycle of further neuronal loss. These discoveries have shifted long COVID from a subjective illness to a proven neurological disorder, opening the door to targeted treatments and more accurate, accessible diagnostics.