What Causes Brain Fog?

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Brain fog isn’t a medical condition itself, but rather a symptom of an underlying issue. It’s characterized by feelings of mental fatigue, difficulty concentrating, and a general sense of cognitive slowness. While often described as feeling “fuzzy” or “cloudy,” the experience can vary significantly between individuals.

Numerous factors can contribute to brain fog. Common causes include:

• Sleep problems: Insufficient or poor-quality sleep is a major contributor. [https://www.sleepfoundation.org/brain-fog](https://www.sleepfoundation.org/brain-fog)
• Diet: Nutritional deficiencies (e.g., vitamin B12, vitamin D), food sensitivities, and dehydration can all play a role. [https://www.healthline.com/nutrition/brain-fog](https://www.healthline.com/nutrition/brain-fog)
• Stress: chronic stress elevates cortisol levels, which can impair cognitive function. [https://www.apa.org/topics/stress](https://www.apa.org/topics/stress)
• Medical conditions: Brain fog is a symptom associated with a wide range of conditions, including fibromyalgia, chronic fatigue syndrome, autoimmune diseases (like lupus and rheumatoid arthritis), and long COVID. [https://www.cdc.gov/coronavirus/2019-ncov/long-term-effects/index.html](https://www.cdc.gov/coronavirus/2019
  

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