Underlying conditions are often overlooked as causes of thinking impairment. Common causes of fuzzy thinking include obstructive sleep apnea, medication side effects, an underactive thyroid, low levels of vitamin B12, or anxiety and depression. Treating an underlying condition can often resolve fuzzy thinking. If not, a visit to a neuropsychologist may be necessary. Other ways to improve clarity include eating a healthy diet, such as the Mediterranean diet; exercising; and getting more sleep.
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