Myths vs facts: FT4 and allergy

FT4 (free thyroxine) is a thyroid hormone regulating metabolism. There are claims that thyroid hormones influence allergies, but evidence is limited. Myth: High FT4 causes allergies. Fact: FT4 levels are not directly linked to allergic reactions; allergies involve IgE and immune cells. Myth: Thyroid tests can replace allergy tests. Fact: They assess different systems. Caveat: Severe thyroid dysfunction may modulate immune responses, but this is not specific to allergies. For allergy concerns, consult a physician and undergo specific allergy testing.