Start with a GP appointment
Describe what you ate, when symptoms started and what happened. Take ingredient labels or photos if available. A food and symptoms diary can help your clinician investigate.
NHS: diagnosis and food diaries ↗Feel unwell after eating?
Speak to your GP if you suspect a food allergy or symptoms keep returning. Feeling ill after food can have several causes.
NHS: food allergy ↗Testing follows your symptoms
A clinician may arrange targeted skin-prick or blood tests and refer you to an allergy specialist. Your history and test results are assessed together. Do not try eating a suspected trigger to test yourself.
British Dietetic Association: testing ↗Considering private care?
You can seek assessment from a qualified allergy clinician privately. Ask who will interpret the tests, how they relate to your symptoms and what follow-up is provided. A broad commercial test panel is not a substitute for clinical assessment.
British Dietetic Association: choosing appropriate tests ↗Allergy and intolerance are different
They need different assessment. The NHS advises against some commercial intolerance home tests because evidence for their accuracy is limited. Do not remove whole food groups without advice from a GP or dietitian.
NHS: intolerance and home tests ↗Bring useful details
Food and drink, ingredient labels, portion size, symptom timing, medicines taken and any photos of symptoms. Your clinician can advise what to record next.
And It Has helps you access food information. Diagnosis and treatment come from your healthcare professional.
Explore hidden ingredients ↗Sources checked 1 November 2026.