What Is Brain Fog?
Brain fog isn't a medical diagnosis itself — it's a cluster of symptoms including poor concentration, forgetfulness, and a feeling of mental fatigue or confusion. It can stem from many underlying causes.
Common Causes
- Poor sleep or sleep disorders
- Chronic stress and anxiety
- Hypothyroidism
- Vitamin B12 or vitamin D deficiency
- Anaemia (low iron)
- Blood sugar imbalances
- Post-viral fatigue (including post-COVID)
- Certain medications
Tests Your Doctor May Order
| Test | Purpose |
|---|---|
| TSH | Checks thyroid function |
| Vitamin B12 & Folate | Common deficiencies linked to cognitive symptoms |
| Vitamin D | Low levels are linked to fatigue and poor concentration |
| CBC | Checks for anaemia |
| Fasting Glucose / HbA1c | Rules out blood sugar imbalance |
| CRP | Screens for underlying inflammation |
What Helps
- Prioritising 7–9 hours of quality sleep
- Treating any underlying vitamin deficiency or thyroid issue
- Regular physical activity
- Managing stress with relaxation techniques
- Limiting alcohol and reducing screen time before bed
- Staying hydrated and eating balanced meals
Important: Persistent brain fog deserves a medical work-up to rule out treatable causes like thyroid disease or vitamin deficiency.