What is brain fog and what causes it?
Answered by the AskDoc Medical Team · Medically reviewed under our Medical Director, MBBS
Brain fog is not a diagnosis but a description: sluggish thinking, poor focus, words out of reach. Its usual engines are unglamorous: short or broken sleep, chronic stress, low mood, sedating medicines, alcohol, thyroid problems, iron or B12 deficiency, blood sugar swings, menopause, and the wake of infections.
Because the causes are mostly findable, fog that persists deserves basic blood tests and an honest sleep audit rather than supplements marketed at it.
Fog with confusion that worsens, or memory loss that disrupts daily function, especially in older adults, moves beyond fog and needs proper assessment.
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