Myths vs facts: Ferritin and stress

The relationship between ferritin and stress is often misunderstood. Ferritin is an iron storage protein and also an acute-phase reactant, meaning its levels can rise during inflammation. Chronic psychological stress can trigger low-grade inflammation via cytokines like IL‑6, which upregulates hepcidin, thereby reducing iron absorption and potentially altering ferritin levels. A common myth is that high ferritin always indicates iron overload; in reality, it can be elevated due to stress, infection, obesity, or metabolic syndrome. Conversely, low ferritin is frequently linked to fatigue and stress, but the direction of causality is unclear—iron deficiency causes fatigue, but stress does not directly deplete iron stores. The evidence is primarily mechanistic and observational; no high-quality clinical trials confirm a direct, independent link between stress and ferritin. For consumers using DTC tests (e.g., MyBody-X wellness panels), a single ferritin measurement is confounded by circadian rhythm, menstrual phase, recent meals, and inflammation. Therefore, results should be interpreted cautiously and not used for diagnosis. Safety note: ferritin <30 µg/L suggests iron deficiency; levels >200 µg/L (women) or >300 µg/L (men) warrant further medical evaluation for hemochromatosis or chronic inflammatory conditions.