Yes, allergies can cause shortness of breath. Allergic reactions can lead to increased mucus production in the airways alongside airway narrowing, making breathing more difficult. This happens due to the release of histamine, a chemical produced by the body in response to an allergen, which can cause inflammation and swelling in the airways.
Allergic rhinitis, commonly known as hay fever, is one example of an allergic condition that can cause shortness of breath. When the nose becomes congested due to an allergic reaction, breathing through the nose becomes difficult, often leading to mouth breathing – which can cause dryness of the throat and mouth, and a sensation of breathlessness.
Asthma is another allergic condition linked to shortness of breath. Asthma is a chronic lung condition where the airways become inflamed and narrowed, making breathing difficult. Allergic asthma is triggered by allergens such as dust mites, pet dander, mould and pollen.
Shortness of breath caused by allergies would typically improve after taking an antihistamine.
If shortness of breath is new, doesn't improve after taking an antihistamine, or you're concerned about its severity or duration, it's important to consult a healthcare professional to determine the cause and appropriate treatment.
What Causes Allergies?
Allergies occur when the immune system overreacts to a substance that's normally harmless – such as pollen, mould, dust or pet dander, known as allergens. When an allergen enters the body, the immune system mistakenly identifies it as harmful and releases chemicals, including histamine, to fight it off. This response can cause symptoms including sneezing, a runny nose, itchy eyes, and shortness of breath.
The exact cause of allergies isn't fully understood, but is thought to involve a combination of genetic and environmental factors. A family history of allergies increases the likelihood of developing them, and environmental factors such as pollution exposure may also play a role.
Allergies can develop at any age and affect people differently – some experience only mild symptoms, while others face more severe symptoms that meaningfully impact daily life.
Allergies can also be triggered by food, medications, and insect bites or stings, in addition to inhaled allergens. Different types – seasonal, perennial, food and drug allergies – each have their own triggers and symptom patterns.
How Many People Are Affected by Allergies?
Allergies are a common health issue affecting a significant proportion of people worldwide, with global prevalence estimates in the region of 30-40% of the population affected by at least one allergy, according to allergy health organisations. Prevalence varies by country and region, and is generally considered to be rising in many parts of the world, though exact figures vary depending on the population surveyed and the criteria used.
Symptoms of Allergies
Symptoms vary depending on the allergen and individual response, but commonly include:
Sneezing and a runny nose: caused by histamine release, which makes blood vessels in the nose swell and produce excess mucus.
Itchy eyes, nose and throat: also caused by histamine release, triggering itching and swelling.
Nasal congestion: swollen blood vessels and excess mucus can make nasal breathing difficult.
Cough: often due to postnasal drip, where excess mucus runs down the back of the throat.
Hives and eczema: skin reactions causing red, itchy, raised, swollen skin.
Anaphylaxis is a severe allergic reaction that can occur within minutes of exposure to an allergen and can be life-threatening. Symptoms include:
- Swelling of the mouth, throat or tongue, causing difficulty breathing, wheezing, throat tightness and swallowing difficulty
- Itchy skin or a raised, red rash (hives)
- Swollen eyes, lips, hands or feet
- Abdominal pain, nausea or vomiting
- Feeling lightheaded or faint due to low blood pressure, potentially leading to collapse or loss of consciousness
These symptoms can vary in severity and duration – consult a healthcare professional if you experience severe or prolonged symptoms. If you suspect you or someone with you is experiencing anaphylaxis, call emergency services immediately.
Managing Allergy Symptoms
Several approaches can help manage allergy symptoms:
Medications: a range of over-the-counter antihistamines is available, with different options suited to different needs in terms of onset speed, duration and drowsiness. Nasal sprays can also help relieve congestion. Always check with a pharmacist for the correct option and dosage for your age and any other medical conditions or medications you're taking, and speak to your GP for more severe or persistent symptoms, who may recommend stronger prescription treatment.
Allergen avoidance: one of the most effective ways to prevent reactions is avoiding known triggers – for example, staying indoors when pollen counts are high and keeping windows closed if you have a pollen allergy.
Nasal irrigation: rinsing the nasal passages with a saline solution can help remove allergens and reduce inflammation.
Air purifiers: can help reduce allergens in indoor air, potentially easing symptoms.
Immunotherapy: also known as allergy injections, a longer-term treatment that can help reduce sensitivity to specific allergens, generally used for allergies that are difficult to manage with other treatments.
Lifestyle factors: regular exercise, a balanced diet and adequate sleep can support overall immune function and may help reduce symptom severity.
The most appropriate approach varies by individual, allergen and symptom severity – a pharmacist or GP is the best starting point for a tailored treatment plan.
