Pollen allergy and asthma are closely linked. It is estimated that 30–40% of people with allergic rhinitis also develop allergic asthma, and in 70–80% of asthmatics, some pollen allergy is present. Understanding this connection helps patients recognize symptoms early and prevent more serious deterioration.

What connects rhinitis and asthma

The lining of the nose and the lining of the bronchi are part of the same respiratory system. When pollen irritates the nose, a similar inflammatory reaction can gradually develop in the lower respiratory tract. This is called the concept of "unified airway" — disease manifests at multiple levels:

  1. Allergic rhinitis — most common manifestation, symptoms in nose and eyes.
  2. Allergic asthma — periodic or chronic inflammation of bronchi with reversible narrowing.
  3. Asthma + rhinitis — combination present in a large part of more severely affected patients.

Treating rhinitis reduces the risk of asthma development in allergy sufferers. This especially applies to immunotherapy.

Typical asthma symptoms

These differ from "ordinary" rhinitis:

  • Chest tightness — feeling like a band around the chest.
  • Difficulty breathing, especially with exertion or at night.
  • Wheezing — high-pitched sound during exhalation.
  • Persistent cough, especially at night or early morning.
  • Rapid fatigue when running or climbing stairs.

Symptoms are typically worse on windy days, after mowing, during your allergy season and in thunderstorms (specific phenomenon, see below).

Thunderstorms and ragweed

"Thunderstorm asthma" is a phenomenon in which thunderstorms during pollen season can trigger mass asthma attacks. Mechanism:

  • Humidity and lightning break pollen grains into smaller fragments.
  • These fragments are small enough to reach deep into bronchi, where they cause strong inflammation.
  • The result can be a sudden wave of asthma attacks in the area after the storm.

In Croatia this especially applies to combination of ragweed + summer thunderstorms in September. If you are an asthmatic with ragweed allergy and a storm is expected, keep your inhaler with you and consider staying indoors until the storm passes.

How to distinguish asthma worsening from ordinary rhinitis

See your doctor if, along with typical pollen symptoms, you:

  • cough without stopping for more than several days
  • wake up at night with breathing difficulty
  • become short of breath quickly with normal activity
  • have chest tightness or wheezing
  • your inhaler helps less than usual

If symptoms worsen rapidly, speech becomes difficult, or lips turn blue — seek urgent medical help.

Diagnosis

Your doctor combines medical history (timing of symptoms) with:

  • Spirometry — measuring lung function; bronchial narrowing is reversibly measured before and after bronchodilator.
  • PEF (peak flow) measurement — portable device for monitoring airflow at home.
  • Allergy tests — determining which pollen you react to.
  • FeNO (fractional exhaled nitric oxide) — indicator of eosinophilic inflammation in bronchi.

Therapy

Medications taken regularly

  • Inhaled corticosteroids (budesonide, fluticasone, beclomethasone) — foundation of asthma control; suppress airway inflammation. Must be taken regularly, even when symptom-free.
  • Combination inhalers (corticosteroid + long-acting beta-2 agonist) for moderate and severe asthma.
  • Leukotriene antagonists (montelukast) — especially useful in allergic asthma with major allergy component.

Medications for acute attacks

  • Short-acting beta-2 agonist (salbutamol, popular "ventolin") — quickly opens airways. Have it with you at all times during season.

Immunotherapy

Specific immunotherapy for the pollen causing asthma can reduce asthma severity and medication needs. It is especially recommended for patients with allergic asthma who already have a clearly defined allergen and good results with antihistamines.

Biological medications

For severe forms of allergic asthma that do not respond to standard therapy, biological medications are available (omalizumab, mepolizumab, dupilumab). These are monoclonal antibodies that specifically block certain parts of the immune response. They are prescribed by a pulmonologist or allergist, and therapy is available in Croatia through hospital centers.

Practical measures for asthmatics with pollen allergy

  • Check pollen forecasts and adjust activities accordingly.
  • Inhaler always with you during season.
  • Do not skip regular control medications — the biggest cause of severe attacks is exactly this.
  • Prepare an asthma action plan with your doctor — what to do when PEF drops, when to increase therapy, when to call emergency.
  • Get flu vaccination every year — viral infection often triggers asthma.

Note

Asthma is a serious illness requiring regular monitoring by a doctor. Do not change therapy on your own. This text is informational and does not replace medical advice.