Signs and symptoms of possible food allergya,1
| IgE mediated (usually evident within minutes) | Non-IgE mediated (may be several hours before they present) |
|---|---|
| Skin | |
| Pruritus | Pruritus |
| Erythema | Erythema |
| Acute urticaria: localised or generalised | Atopic eczema |
| Acute angioedema: most commonly lips, face, around eyes | |
| Gastrointestinal system | |
| Angioedema: lips, tongue, palate | Gastroesophageal reflux disease |
| Oral pruritus | Loose or frequent stools |
| Nausea | Blood and/or mucus in stools |
| Colicky abdominal pain | Abdominal pain |
| Vomiting | Infantile colic |
| Diarrhoea | Food refusal or aversion |
| Constipation | |
| Perianal redness | |
| Pallor and tiredness | |
| Faltering growth: in conjunction with at least ≥1 of the above gastrointestinal symptoms (with or without significant atopic eczema) | |
| Respiratory system (usually in combination with ≥1 of the above symptoms and signs) | |
| Upper respiratory tract symptoms: nasal itching, sneezing, rhinorrhoea, or congestion (with or without conjunctivitis) | |
| Lower respiratory tract symptoms: cough, chest tightness, wheezing, or shortness of breath | |
| Other | |
| Signs or symptoms of anaphylaxis or other systemic allergic reactions | |
↵a This list is not exhaustive. The absence of these symptoms does not exclude food allergy.