Immediate symptoms

Anaphylaxis
(multiple severe symptoms)
Feeling of impending doom
Low blood pressure/shock
Dizziness/lightheadedness
Hives
Facial/skin swelling
Throat swelling/itchy mouth
Difficulty breathing/cough
Nasal congestion/runny nose
Vomiting
Diarrhea/cramping

Delayed symptoms

Stomach cramping
Nausea/vomiting
Bloating, gas
Diarrhea or constipation
Blood in stools
Headache/migraine
Eczema/rashes
Irritability/lethargy
Brain fog/forgetfulness
Weight loss or gain
 

Allergies

Food allergy
Pollen food allergy syndrome (PFAS)/Oral allergy syndrome (OAS)
Alpha-gal syndrome
Food-dependent Exercise-induced Anaphylaxis (FDEIA)

Mixed Reactions

Atopic Dermatitis (Eczema)
Eosinophilic Esophagitis (EoE)
Eosinophilic Gastrointestinal Disorders (EGID)
Food Protein-Induced enterocolitis syndrome (FPIES)
allergic part of the spectrum

Masqueraders

Milk, gluten, and other food sensitivities
Lactose intolerance
Chemical sensitivities (e.g., caffeine, amines, sulfites, salicylates, alkaloids, MSG, alcohol)
Intolerance to food additives, dyes, preservatives
Intolerance to certain carbs (e.g., fructose, sugar alcohols)
Allergic contact dermatitis
Gustatory rhinitis

Other Masqueraders

Gastrointestinal disorders (e.g, IBS, IBD)
Celiac disease
Gastroesophageal reflux disease (GERD)
Hiatal hernia
Food poisoning (e.g., Salmonella, scombroid)
Intestinal infections
Food phobias/aversions
Eating disorders
Non-allergic part of the spectrum

Spectrum of Adverse Food Reactions

arrows pointing left and right to indicate the spectrum of possible reactions with allergic pointing left and non-allergic pointing right

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The Spectrum of Adverse food Reactions