Allergic Asthma
Symptoms, Causes, Diagnosis and Treatment for Allergy-Triggered Asthma
Allergic asthma is a type of asthma in which symptoms are triggered or worsened by allergens such as house dust mites, pollen, pets or mould. These allergens can lead to airway inflammation, causing wheezing, cough, chest tightness and shortness of breath.
At the London Allergy and Immunology Centre, we provide specialist assessment for children and adults with suspected allergic asthma, including allergy testing, spirometry, FeNO testing and personalised treatment plans.
Specialist diagnosis and treatment for allergic asthma, including respiratory testing, allergy assessment and personalised long-term care.
What is Allergic Asthma?
Asthma is a chronic inflammatory disease of the airways. In allergic asthma, symptoms are linked to sensitisation to specific allergens. When the allergen is inhaled, the immune system reacts and causes airway narrowing, swelling and increased mucus production.
Allergic asthma often occurs alongside hay fever, eczema or other allergic conditions. NHS and UK respiratory guidance also recognise that identifying triggers is an important part of asthma care.
✔ Allergy can trigger or worsen asthma symptoms
✔ Indoor allergens such as dust mites and pets are common causes
✔ Outdoor allergens such as grass and tree pollen may worsen asthma seasonally
✔ Managing allergy triggers can support better asthma control
Symptoms of Allergic Asthma
The main symptoms are similar to other types of asthma, but they may clearly worsen after exposure to allergens.
Typical Asthma Symptoms
✔ Wheezing
✔ Coughing
✔ Shortness of breath
✔ Chest tightness
✔ Night-time or early morning symptoms
Features Suggesting Allergy
✔ Symptoms after exposure to dust, pets or pollen
✔ Seasonal worsening, especially in spring or summer
✔ Co-existing hay fever or eczema
✔ Indoor symptoms linked to bedding or house dust
Common Allergy Triggers
House Dust Mites
A major cause of year-round indoor allergic asthma, often associated with night-time symptoms.
Pollen
Tree, grass and weed pollen can worsen asthma control during the relevant pollen season.
Pets
Pet dander and saliva proteins may trigger symptoms in sensitised individuals.
Mould
Damp indoor environments and mould exposure can worsen respiratory symptoms in some patients.
Allergy and rhinitis are closely linked with asthma. NHS respiratory guidance notes that treating allergic rhinitis is part of an integrated approach because poorly controlled nasal allergy can worsen asthma symptoms.
How is Allergic Asthma Diagnosed?
Diagnosis usually involves confirming asthma first, then assessing whether allergy is an important trigger.
Clinical History
We review the pattern of symptoms, night waking, seasonal changes, likely exposures and any associated eczema or hay fever.
Allergic asthma diagnosis and management at a specialist allergy clinic in London, including inhaler use and lung function assessment
Respiratory Testing
Assessment may include spirometry and FeNO, which are used in UK asthma pathways to support diagnosis and monitoring.
Allergy Testing
Skin prick testing and/or specific IgE blood tests may identify sensitisation to dust mites, pollen, pets or mould.
A positive allergy test does not always mean the allergy is clinically important, so test results should always be interpreted alongside symptoms and trigger history.
Treatment for Allergic Asthma
Treatment aims to control symptoms, reduce flare-ups and address allergy-related triggers where possible.
Standard Asthma Treatment
Current asthma guidance emphasises inhaled corticosteroid-based treatment rather than relying on reliever medication alone.
Trigger Reduction
Dust mite reduction, pet advice, pollen avoidance and mould control may help support better control in sensitised patients.
Treating Related Allergy
Managing co-existing hay fever and allergic rhinitis can improve overall respiratory symptoms and daily functioning.
Can Immunotherapy Help?
In selected patients, allergen immunotherapy may be considered as an add-on treatment, particularly in house dust mite-driven allergic asthma. EAACI guidance supports HDM allergen immunotherapy as an add-on option in selected patients, and position papers note that SLIT is used in controlled or partially controlled HDM-driven allergic asthma with appropriate lung function thresholds.
✔ May reduce symptoms in selected allergy-driven asthma
✔ Requires specialist assessment before treatment
✔ Not suitable for every patient with asthma
✔ Usually considered alongside standard asthma inhaler treatment
Immunotherapy is not a replacement for appropriate asthma medication, but it may be helpful in carefully selected patients with clear allergen-driven disease.
Allergic Asthma in Children
Allergy is a particularly common driver of asthma in children. Many children with allergic asthma also have hay fever or eczema, and symptoms may clearly worsen with pets, dust or pollen exposure.
Specialist paediatric assessment can help identify the trigger pattern, confirm whether symptoms are asthma-related, and optimise long-term management.
When Should You Seek Specialist Review?
✔ Asthma remains poorly controlled despite treatment
✔ Symptoms clearly worsen with pets, pollen or dust exposure
✔ You have frequent flare-ups or night-time symptoms
✔ You also have hay fever, eczema or other allergic conditions
✔ You want to explore whether allergy immunotherapy may be appropriate
In England’s 2025/26 QOF guidance, specialist referral is recommended when asthma is not controlled despite high-dose inhaled corticosteroid-containing treatment in relevant age groups.
Why Choose the London Allergy and Immunology Centre?
We provide specialist care for children and adults with suspected allergic asthma, allergy-related rhinitis and complex trigger patterns.
Specialist Assessment
Integrated review of asthma symptoms, respiratory testing and allergy triggers.
Targeted Testing
Skin prick testing, specific IgE blood testing, spirometry and FeNO where appropriate.
Personalised Treatment
Medication review, trigger reduction advice and immunotherapy assessment for suitable patients.
Book an Allergic Asthma Consultation
Arrange specialist assessment for asthma symptoms, allergy triggers, testing and long-term treatment planning.