Many patients struggling with Long COVID brain fog describe it as a mist that rolls in without warning. Suddenly, the morning seems harder, the words don’t come as easily, and even simple tasks feel like mental gymnastics. Unlike typical fatigue, this mental haze doesn’t always clear with rest. It lingers, fluctuates, and often arrives uninvited.
The phenomenon of COVID brain fog isn’t about becoming forgetful or distracted. Research now links it to lingering inflammation, disrupted oxygen and blood-flow dynamics, and nervous-system dysfunction. At Spero Clinic, we reference findings from our founder, Dr. Katinka van der Merwe, who explains that the autonomic nervous system (the same network that governs heart rate, breathing, and circulation) can stay in survival mode long after the virus has cleared. In her upcoming book Neurochaos, she writes:
“The body remains stuck in fight-or-flight mode … when the brain keeps sending alarm signals, it prevents the body from doing what it does best—healing.”
In short, brain fog is the brain’s way of waving a red flag: Something is out of sync.
One of the most frustrating questions is: how long does COVID brain fog last? The honest answer: it varies. For some, it lifts gradually over weeks; for others, it persists for months. Because the underlying issue often involves nervous-system and autonomic imbalance, recovery doesn’t always follow a linear path. Patients may experience a breakthrough day, followed by a setback, something that Dr. Katinka has coined “neurochaos.” Recognizing that this isn’t a sign of failure, but part of the journey, is a key step in healing.
Disclaimer: The information written on this website is designed to provide helpful information on various conditions and the subjects discussed. This website is not meant to be used to diagnose or treat any medical condition or to replace the advice of your physician(s). The author of this website does not claim to treat, diagnose or cure Long COVID, CRPS, EDS/POTS, AMPS, or any other specific condition or infection. The Spero Clinic treats the central nervous system only, often resulting in the body being able to heal itself.
You should regularly consult a physician in matters relating to your health, particularly with respect to any symptoms that may require diagnosis or medical attention. For diagnosis or treatment of any medical problem, consult your own physician(s).
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