Seasonal allergies: causes, symptoms and treatment

Seasonal allergies, often called hay fever or allergic rhinitis, affect millions of people. They are more than an annoying runny nose problem. They come from a genetic tendency to produce allergic reactions and an immune system that becomes over-responsive because of environmental and lifestyle factors. Managing allergies well means reducing exposure, calming inflammation and supporting the immune system over the long term.

What is hay fever

Hay fever is the everyday term for allergic rhinitis. It causes sneezing, nasal congestion, a runny nose and itchy or watery eyes. Whilst a cold is caused by a virus, hay fever is the result of your immune system misreading harmless allergens like pollen as a genuine threat and releasing histamine when they are encountered.

How the immune system gets it wrong

When you first meet an allergen, your immune system may produce IgE antibodies. These IgE antibodies attach to mast cells in the nose, eyes, and airways. The next time you meet the allergen, these mast cells release histamine. Histamine is a chemical compound released in the body and plays a role in allergic reactions by causing symptoms like swelling, redness, itching, and congestion.

Why symptoms can last for hours

There is also a late-phase response. This is driven by inflammatory cells like eosinophils and T-helper type 2 cells. They keep the nasal lining inflamed and reactive for many hours. This is why some people feel congested or foggy throughout the day, not only at the moment of exposure.

Why some people get allergies and others do not

Seasonal allergies develop because both genetics and environment shape your immune system.

Genetic risk

Atopy means you inherit a tendency to produce IgE easily. Families with hay fever, eczema, or asthma often see these conditions appear across generations. Twin studies show hay fever can be highly heritable. Genetics provide the potential for allergies but do not decide the outcome alone.

Early-life environment

The original hygiene hypothesis suggested that children growing up in very clean environments were more likely to develop allergies. The modern version focuses on microbial diversity. Children who grow up with a wider range of microbes, such as through outdoor play, animals or siblings, develop stronger immune tolerance. A lack of microbial exposure can push the immune system towards an IgE-heavy, allergy-prone pattern.

Immune balance

Healthy immune development depends on a balance between T-helper 1 and T-helper 2 responses. Too little microbial stimulation in early life can tilt the system towards a stronger T-helper 2 pattern. This makes allergic reactions more likely.

The modern problem: climate change

Whether you believe in climate change or not, our weather is changing, making seasonal allergies worse. We are already seeing:

• earlier pollen seasons
• longer pollen seasons
• higher pollen counts
• more potent pollen
• the arrival of invasive alien flora species that can be allergenic

Longer and stronger seasons mean a higher pollen load on the body, which increases symptoms even for people with mild hay fever.

How to reduce your exposure

You cannot avoid pollen completely, but you can reduce the amount you bring into your home and the amount you inhale.

Personal habits

• Shower and wash your hair after being outdoors. This removes pollen stuck to skin and hair.
• Change clothes immediately after outdoor exposure.

Around the home

• Keep windows closed, especially in the morning and early evening, when pollen peaks.
• Vacuum regularly using a HEPA filter.
• Avoid drying laundry outdoors on high pollen days.
• Try not to cut grass yourself during the season.

Outdoor awareness

• Follow local pollen forecasts and adjust activities on high-count days.
• Avoid grassy or open fields during peak times.

Medication options

Medication is useful for managing symptoms, but remember it will not cure allergies.

Antihistamines

These block the release of histamine, and so they help to reduce itching, sneezing and a runny nose. Modern versions usually do not cause drowsiness.

Nasal corticosteroids

These nasal sprays work to reduce inflammation & mucus in the sinuses that your body makes in response to the allergen it is triggered by. They work best when started before the season begins, but they can have side effects for the sinuses and eyes. These side effects may even mimic the symptoms you are treating. Some research suggests that they can also have effects on growth if used long-term in children, so monitoring this with your doctor or Paediatrician is recommended.

Do not use inhaled nasal corticosteroids with Trifectiv Plus Air.

Decongestants

These sprays help to unblock the nose but should only be used short term as they can cause rebound congestion.

Immunotherapy: the only disease-modifying treatment

Allergy immunotherapy retrains the immune system, so it becomes less reactive to allergens. It can prevent the development of new allergies and reduce the risk of allergic asthma.

Two forms exist:

• Subcutaneous immunotherapy (SCIT) via injections.
• Sublingual immunotherapy (SLIT) via drops or tablets under the tongue.

This treatment is usually for people with moderate to severe symptoms who do not respond well to standard medication.

How hypochlorous acid can help as an add-on treatment

Hypochlorous acid (HOCl) is a molecule your own immune system makes. The non-toxic medical-grade HOCl from Trifectiv Plus is perfect for inhalation because it is antimicrobial, anti-inflammatory and non-cytotoxic for lung tissue.

Trifectiv Plus Air Nebulising Solution

This is designed for inhalation into the nose and airways. It can help soothe inflamed mucosa and support airway hygiene. People with allergic rhinitis may find it reduces irritation and helps maintain clearer passages.

Why non-toxic medical-grade HOCl is suitable for allergy care

• It is naturally produced by the body.
• It has strong antimicrobial activity, reducing the risk of secondary infection.
• It is anti-inflammatory, which helps calm irritated nasal tissue.
• Clinical studies show HOCl nasal irrigation is safe and improves symptoms.

The key advantage of HOCl in this context is that it supports airway hygiene while also helping to reduce inflammation locally. It does not replace antihistamines or oral corticosteroids but works alongside them. Please note that you should not use inhaled steroids when using Trifectiv Plus Air as the two active ingredients cancel each other out.

Clarifying safety concerns

High exposure to chlorine gas in industrial environments is harmful. This is not comparable to the medical-grade HOCl manufactured by Thoclor Labs and used in controlled concentrations. This HOCl is non-toxic and designed for safe mucosal use by anyone in the family.

Conclusion

Seasonal allergies occur when genetics, immune development and environment intersect. Climate change is making symptoms worse and more prolonged. Good allergy management focuses on reducing pollen exposure, using the right medication, and even looking at treatments like immunotherapy for long-term improvement.

Trifectiv Plus Air Nebulising Solution offers an additional supportive option for people who want to maintain clear, soothed and healthy airways during allergy season.