What should you know about IgE and asthma?

IgE is an antibody involved in some allergic reactions. When a person with allergic asthma meets a trigger, immune signals can narrow and irritate the airways. Asthma may cause wheezing, cough, chest tightness or shortness of breath, but these symptoms can have other causes. A raised IgE level may support an allergic pattern; it does not show how severe asthma is or identify every trigger. A clinician combines the history with examination and breathing tests. Allergic rhinitis and house dust mite allergy can occur alongside asthma, so describing nose and home-related symptoms is useful.

Keep a record of symptoms, possible triggers, exercise, sleep disruption and inhaler use. Follow the asthma plan prescribed for you and use inhalers exactly as taught. Reduce exposure to a confirmed trigger where practical, without making broad restrictions based only on an IgE result. Your clinician may consider allergy assessment, lung-function testing or changes to preventer treatment. A [Nebuliser Treatment](/treatments/acute-and-urgent-care/nebuliser-treatment/) delivers medicine as a mist in selected situations; it is not a substitute for an individual asthma plan. See [Asthma](/conditions/asthma/) for condition-focused information.

Use your prescribed reliever plan and seek urgent medical help if breathing remains difficult, speaking is hard, the chest feels increasingly tight, or symptoms worsen quickly. Emergency care is needed if someone becomes exhausted, confused, faint or develops blue or grey lips. Do not wait for an IgE test result during a breathing flare. For symptom context, read [Wheezing](/symptoms/wheezing/), [Cough](/symptoms/cough/) and [Chest Tightness](/symptoms/chest-tightness/).

Ask whether your asthma appears allergic, which triggers are worth testing, and how the result would affect treatment. Ask when to use your reliever, how to check inhaler technique, and what signs mean you should attend urgent care.