Though brain fog isn’t a medical term, you know it when you have it—thoughts seem sluggish, thinking feels muddled, and your brain just feels foggy. Also referred to as “clouding of consciousness,” brain fog is a common symptom of long COVID. New research suggests that a compromised blood-brain barrier is one of the causes of brain fog.
The blood-brain barrier (BBB) is composed of brain endothelial cells and surrounding cells, serving as a barrier between the bloodstream and the brain. When the BBB is compromised, harmful substances from the bloodstream can enter the brain, often resulting in central nervous system disorders.
