Table 3.

Differential diagnosis of IgE mediated allergy to wheat

Vasovagal reactions
Non-IgE mediated food allergy	Food protein induced enterocolitis considered in infancy
	Celiac disease
Flush syndrome	Carcinoid
	Postmenopausal
	Chlorpropamide-alcohol
	Autonomic epilepsy
Restaurant syndromes	Sodium glutamate
	Sulfitis
	Scombroid
Non-anaphylactic shock	Hemorrhagic
	Cardiac
	Endotoxic
	Monoclonal gammopathy (parossistica hyperpermeability)
Syndromes with excessive endogenous production of histamine	Idiopathic urticaria
	Idiopathic angioedema
	Mastocytosis
	Urticaria pigmentosa
	Basophil leukemia
	Promyelocytic acute leukemia acute
	Hydatid cyst
Nonorganic syndromes	Panic attack
	Munchausen
	Vocal cord dysfunction
	Hysteric bolus
	Anorexia nervosa
Miscellaneous	Hereditary angioedema
	Anaphylaxis due to progesterone
	Urticaria vasculitis
	Feocromocitoma
	Hyper IgE syndrome
	Neurologic diseases (seizures, stroke)
	Pseudo-anaphylaxis
	Red man syndrome (Vancomycin)
	Constipation
	Irritable bowel syndrome

Abbreviation: IgE, immunolglobulin E.