What should you know about the hygiene hypothesis and asthma?

The hygiene hypothesis proposes that changes in childhood environments may alter immune development and influence allergic conditions. Asthma is shaped by several factors, including inherited tendency, airway sensitivity, allergens, infections, smoke and air pollution. The idea does not mean that poor hygiene prevents asthma, or that deliberate exposure to infection is safe. Asthma can involve wheezing, cough and chest tightness, while allergic rhinitis and house dust mite allergy may coexist and affect symptoms. A chronic cough has other possible causes, so symptoms need proper assessment.

Follow your personalised asthma plan and use inhalers with the technique taught by your clinician. Reduce known triggers such as smoke, strong scents or identified allergens, while keeping the home clean without using harsh fumes. Do not stop preventer treatment because of an online theory. If symptoms are worsening, ask whether your medicines, inhaler technique or action plan need review. A nebuliser treatment may be used in some acute settings, but it is not a substitute for emergency assessment when breathing is severely affected.

Get urgent help if you are struggling to speak in full sentences, breathing rapidly, becoming exhausted, developing blue or grey lips, or not improving with your reliever according to your action plan. Sudden severe chest tightness or wheezing also needs prompt attention. Do not wait for symptoms to settle if breathing is becoming harder.

Ask which triggers matter for you, how to check inhaler technique, when to use your action plan, and how to recognise an asthma flare early.