Brain Fog After Long COVID: A Functional Medicine Approach to Healing

Ron Suzuki MD

Published on: 30/12/2025

Brain Fog After Long COVID: A Functional Medicine Approach to Healing If you or your patients are struggling with lingering brain fog after COVID-19, you’re not alone. Difficulty concentrating, memory lapses, mental fatigue, and a feeling of “thinking through cotton” are some of the most common and frustrating symptoms of Long COVID. From a functional medicine perspective, brain fog isn’t a diagnosis—it’s a signal. It tells us that underlying systems in the body are out of balance. Instead of masking symptoms, functional medicine asks a deeper question: Why is the brain struggling to function clearly?