IBS and food allergy testing

A food allergy can cause symptoms such as hives, itching, swelling, wheezing, vomiting or throat tightness soon after exposure. IBS more often causes recurring abdominal pain linked with bowel habit changes, including diarrhoea, constipation, gas or bloating. The two can coexist, and food-related symptoms can be difficult to label from timing alone. Skin-prick testing or a blood test may identify sensitisation, but a positive result needs interpretation alongside your history. Broad home test panels can create confusion and unnecessary food restriction.

Record the food, portion, timing, symptoms, and whether symptoms occurred on other occasions. Note medicines and any history of allergic conditions. Do not deliberately eat a suspected trigger to test yourself. A clinician may recommend targeted testing or a supervised food challenge when appropriate. Continue eating a varied diet unless advised otherwise, because unnecessary restriction can affect nutrition and make IBS management harder. A dietitian can help if several foods seem problematic.

Call emergency services immediately for trouble breathing, swelling of the tongue or throat, faintness, or symptoms affecting more than one body system after eating. These may indicate anaphylaxis. For recurring reactions without breathing problems, arrange medical review and avoid the suspected food until you have advice. Seek routine assessment for ongoing bowel symptoms, because allergy testing alone cannot explain every cause of abdominal discomfort.

Do my symptoms fit an immediate allergy, IBS, or another problem? Which test, if any, is appropriate for the food I suspect? Should I avoid that food while waiting? How can I keep my diet nutritionally balanced? What emergency symptoms should my household recognise?