Study of 14 Long COVID Patients Finds No Widespread Brain Inflammation, Links Symptoms to 2 Emotional Regions
Updated
Updated · SciTechDaily · Jun 2
Study of 14 Long COVID Patients Finds No Widespread Brain Inflammation, Links Symptoms to 2 Emotional Regions
1 articles · Updated · SciTechDaily · Jun 2
Summary
PET and MRI scans in 14 long COVID patients found no widespread neuroinflammation versus 11 healthy volunteers, challenging a leading explanation for persistent neurological symptoms.
Comparisons with 13 multiple sclerosis patients showed long COVID cases had far lower white-matter inflammatory activity, and blood markers also showed no clear signs of brain inflammation or neurodegeneration.
Scans taken within 16 months of infection showed higher white-matter inflammatory activity than scans done later, suggesting any inflammation may be stronger earlier and fade over time.
Higher anxiety, depression and poorer quality of life were tied to increased cellular activity in the hippocampus and amygdala, pointing researchers toward emotion and stress circuits as a driver of symptom severity.
The findings suggest some patients may benefit more from treatments targeting stress regulation and other mechanisms, rather than anti-inflammatory approaches alone.
If brain inflammation isn't the cause, could stress management be the key to treating long COVID?
Is long COVID brain fog an inflammatory disease or a disorder of the brain's emotion centers?
Rethinking Long COVID: New Evidence Points to Limbic System Dysfunction Over Persistent Inflammation
Overview
Recent research is changing how we understand Long COVID. A major study using advanced brain imaging found that, instead of ongoing widespread inflammation, Long COVID is linked to persistent glial activation in the limbic system—an area of the brain important for emotions and memory. This localized brain activity helps explain common symptoms like fatigue, brain fog, anxiety, and depression. The findings suggest that broad anti-inflammatory treatments may not work for everyone, especially over time. Instead, therapies focusing on emotional regulation and stress management could be more effective, pointing to a new direction for Long COVID care.