7
Table 4. Differential Diagnoses: Entities, in Addition
to Anaphylaxis, and Causative Agents to be
Considered When a Patient Presents to the Office
with Symptoms Suggestive of an Anaphylactic
Episode Including Anaphylaxis
Anaphylaxis
Anaphylaxis from foods, drugs, insect stings
Anaphylaxis from physical factors (exercise, cold, heat)
Idiopathic (cause undetermined) anaphylaxis
Vasodepressor reactions (vasovagal reactions)
Flushing syndromes
Carcinoid
Vasointestinal polypeptide tumors
Mastocytosis and mast cell activating syndrome
Medullary carcinoma of the thyroid
Restaurant syndromes
Monosodium glutamate
Scombroidosis
Nonorganic disease
Panic attacks
Munchausen stridor (factitious anaphylaxis)
Vocal cord dysfunction syndrome
Undifferentiated somatoform anaphylaxis
Prevarication anaphylaxis
Miscellaneous
Hereditary angioedema accompanied by rash
Paradoxical pheochromocytoma
Red man syndrome (vancomycin)
Capillary leak syndrome
