Allergies And Brain Fog
Why Do Allergies Cause ‘Brain Fog’?
Question: When I have
allergies or a cold, I find it difficult to think. How does sinus congestion
affect the brain?
Answer:
The
short answer is no one really knows why people often report feeling “fuzzy headed” when they have allergies
or a cold.
“It’s not something
you could demonstrate on a test or scan,” said Dr. Richard Lebowitz, a
rhinologist and otolaryngologist at NYU Langone Medical Center.
But the condition
is real. Children with untreated allergies perform worse in school than others,
research has found, in part because allergies can interrupt sleep and make
children feel tired, but other factors may be involved as well.
Young students’
grades improve when their allergies are treated with non-sedating, long-acting
medication, studies suggest.
“The thought is
allergies are essentially inflammation in the nose and sinuses,” said Dr. Mark
Aronica, an allergist at the Cleveland Clinic. This inflammation triggers the
release of proteins called cytokines as part of the immune response.
The same process
happens when you have a cold.
“These cytokines are there to help fight infection, and
also have an impact on our ability to think and function and perform,” Dr. Aronica said.
The result is that
people with allergies or a bad cold often feel as if they are seeing the world
through cheesecloth.
The immune
response can also contribute to fatigue.
With allergies that are triggered for
weeks or months at a time, “sleeping off”
that exhaustion isn’t feasible, so treating the allergies is the best approach,
Dr. Aronica said. “If you control the
symptoms, that brain fog may go away.”
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