How are IgE and Müdigkeit related?

The relationship between IgE (immunoglobulin E) and fatigue is indirect, primarily mediated through allergic conditions. IgE is the key antibody in type‑I allergies (e.g., hay fever, asthma, food allergies). During an allergic reaction, mast cells release histamine and other inflammatory mediators, which can cause not only local symptoms like sneezing or itching but also systemic effects. Chronic allergic inflammation, sleep disruption due to nighttime symptoms, elevated cytokine levels (e.g., IL‑6), and side effects of antihistamines can contribute to persistent fatigue and tiredness. However, fatigue is a highly nonspecific symptom. An elevated IgE level alone does not confirm an allergy – it can also occur with parasitic infections, autoimmune diseases, or rare immunodeficiencies. The evidence for a direct causal link between IgE and fatigue is weak, based on observational studies and mechanistic reasoning. Anyone experiencing chronic fatigue should have other causes (iron deficiency, thyroid dysfunction, sleep apnea, depression) evaluated by a physician. Consumer tests measuring IgE are not diagnostic and do not replace medical assessment.