How are Ferritin and Müdigkeit related?

Ferritin is the primary iron-storage protein in the body. Low ferritin indicates depleted iron stores, and even without anemia (normal hemoglobin), this can cause fatigue, brain fog, and reduced physical performance – a condition often called 'latent iron deficiency fatigue.' The evidence is strong: multiple clinical studies show that ferritin levels below 30–50 µg/L are associated with fatigue, independent of hemoglobin. Conversely, elevated ferritin may signal inflammation, infection, or iron overload (hemochromatosis), all of which can also cause exhaustion. A critical caveat: ferritin is an acute-phase reactant – it rises during infections or chronic inflammation, potentially masking a true iron deficiency. Therefore, ferritin should always be interpreted alongside CRP, transferrin saturation, and soluble transferrin receptor for a reliable assessment. A standalone ferritin test has limited value for fatigue workup. If you experience persistent tiredness, consult a doctor for a complete iron panel. Self-supplementation without diagnosis is risky, especially if iron overload is present.