Background: Allergy-related misinformation proliferates across social media platforms, potentially compromising evidence-based patient care, yet comprehensive analyses remain limited.
Objective: To characterize dominant themes, engagement patterns, and public responses to allergy misinformation across major social media platforms.
Methods: We conducted cross-sectional qualitative content analysis of publicly available posts containing allergy misinformation from TikTok, Instagram, Facebook, and X between January and March 2025. Posts with 500 or more interactions were identified using systematic key word searches and coded for misinformation themes by independent reviewers. Public sentiment was assessed through analysis of top-ranked comments.
Results: Among 347 analyzed posts with 12.3 million combined views, natural cure promotion was most prevalent (31%), followed by IgG testing endorsement (24%), medication fearmongering (18%), food allergy misrepresentation (16%), and pharmaceutical conspiracy theories (11%). Natural cure content generated the highest engagement (median, 2,847 interactions; P < .001). Visual platforms (TikTok and Instagram) favored natural cures whereas text-based platforms emphasized conspiracy content. Of 3,470 analyzed comments, 62% were supportive or neutral toward misinformation, with only 38% providing challenged responses. Among corrective comments, only 23% included scientific evidence.
Conclusions: Allergy misinformation achieves high engagement with limited public correction across social media platforms. Health care providers must anticipate IgG testing and natural remedy narratives, integrate myth-busting into counseling, and leverage society-led digital strategies to counter misinformation's influence on clinical care.
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