# Medical factors and nutritional causes of fatigue

> Live situation record from CLSTR: https://clstr.news/situations/medical-factors-and-nutritional-causes-of-fatigue
> Updated: 2026-09-18T01:03:43.000Z. Sources: 4. Developments: 2.

Medical insights have identified various physiological and nutritional factors contributing to fatigue and symptom perception. Early reports highlighted the role of vitamin B12 in supporting mitochondrial function and red blood cell formation, noting that even microscopic deficiencies can cause extreme exhaustion and muscle weakness.

Subsequent data from the Centers for Disease Control and Prevention (CDC) indicates that fatigue is a widespread issue, with over 70% of adults reporting the symptom within a three-month period as of September 2026. Beyond nutritional deficiencies in Vitamin D, B12, and omega-3 fatty acids, sudden fatigue is also linked to viral and bacterial infections, including influenza, COVID-19, and urinary tract infections.

## Timeline

### 2026-09-18: Health factors and nutritional deficiencies linked to fatigue

Fatigue is a common symptom linked to infections, lifestyle factors, and nutritional deficiencies in vitamins D and B12, affecting a significant portion of the adult population.

2 sources. https://clstr.news/cluster/health-factors-and-nutritional-deficiencies-linked-to-fatigue

### 2026-08-21: Health insights on STI symptom perception and vitamin B12's role in fatigue

Health reports discuss why STI symptoms may feel more intense at night due to reduced distractions and physiological changes, and how vitamin B12 deficiency can contribute to fatigue and muscle weakness.

2 sources. https://clstr.news/cluster/health-insights-on-sti-symptom-perception-and-vitamin-b12s-role-in-fatigue

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Cite as: Medical factors and nutritional causes of fatigue. CLSTR, https://clstr.news/situations/medical-factors-and-nutritional-causes-of-fatigue