What to watch with IgE and fatigue?

The provided context does not contain any specific information linking IgE levels to fatigue. IgE is primarily associated with allergic reactions and parasitic infections, while fatigue is a multifactorial symptom. Without relevant evidence from the given knowledge base, no meaningful conclusion can be drawn. Caveat: Isolated IgE elevation does not explain chronic fatigue; clinical evaluation for other causes (e.g., thyroid, iron deficiency, sleep disorders) is essential.