Allergy Immunotherapy Explained: Desensitisation vs the Hay Fever Injection

Written by Dr. Simon Khela MBChB MRCGP, GMC Registered Doctor

Last reviewed: 10-06-2026

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Hay fever can have a major impact on your daily routine, especially when symptoms are acute despite antihistamines, nasal sprays, and allergen-avoiding measures. Two treatments that are frequently discussed for the persistent symptoms of hay fever are allergies immune therapy (desensitisation), along with the use of a hayfever injection.

While both therapies are utilized in conjunction with severe hay fever, they operate in different ways. Allergy immunotherapy seeks to slowly alter the way that the immune system reacts to certain allergens over time, and hay fever shots are used as a method of treatment for the symptoms. Knowing the difference will allow patients to have more discussions with their physician regarding the treatment options available to them.

Allergy Immunotherapy vs the Hay Fever Injection: What's the Difference?

Both are generally considered by those suffering from extreme hay fever; however, their objectives, treatment plans, and expected results differ greatly.

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The main difference is that immunotherapy is specifically designed to treat the allergic reaction itself, while hayfever injections are typically regarded as a method of managing symptoms in a specific season.

What Is Allergy Immunotherapy?

Allergy immunotherapy, or desensitization treatment, reduces the sensitivity of the immune system to certain allergens.

This is a gradual treatment aimed at a specific allergen causing the symptoms. Over a long period of time, it might affect the immune system to be less reactive.

Standard hay fever treatments are taken to relieve symptoms after they occur. In contrast, immunotherapy is the treatment that changes the body’s allergic response for the long-term.

Most people think of immunotherapy as a treatment option for those patients who have moderate to severe hay fever and are not adequately controlled by other hay fever treatments.

What Does Allergy Immunotherapy Involve?

Allergy immunotherapy is a long-term treatment that is divided into several phases.

Assessment and Allergy Testing

Usually, the first step is the allergy test to identify which specific allergen is causing the symptoms.

This can include:

• Skin prick tests.
• Specific IgE blood tests.
• Symptom-based diagnostic assessments.

It is important to identify the particular allergen, as immunotherapy treats one specific allergy.

Updosing Phase

This phase is commonly called the dosing phase.

Allergen exposure will be done in a controlled manner, and this will increase over time. The goal is to allow the immune system to adjust to the allergen in a safe manner and to reduce the incidence of adverse reactions.

The dosing will be done within a controlled time frame, and this will be dependent on the technique being used.

Maintenance Phase

After patients reach a certain dosage level, they enter the maintenance phase.

During this phase, treatment continues to be administered periodically to help consolidate and prolong the positive effects and continue to support the immune system.

How Long Does Treatment Take?

Immunotherapy treatment can be a lengthy and ongoing process.

Many treatment programs are documented to last for approximately three years, with the benefits potentially taking time to develop, and even then, they may not be sustained past the conclusion of treatment.

Given that the treatment is such a large commitment, there is a careful process for determining patients' appropriateness for treatment before initiation.

What Are the Benefits of Allergy Immunotherapy?

The main objective of immunotherapy isn't only to treat symptoms, but to alter the root cause of allergic reactions.

Long-Term Symptom Reduction

Improvement usually develops slowly rather than instantly.

Studies suggest that a lot of patients experience fewer hay fever symptoms after successful immunotherapy treatments.

Reduced Reliance on Medication

As symptoms get better, some patients discover they require less allergy medication than prior to treatment.

Any modifications to the medication regimen must be discussed with your medical professional.

Potential Long-Term Disease Modification

One of the distinctive aspects of immunotherapy is the potential to alter the way that the immune system reacts to allergens.

This is the reason why immunotherapy is frequently described as a treatment that can modify the course of a disease instead of a solely symptom-control treatment.

What Are the Benefits and Limitations of the Hay Fever Injection?

The injections for hayfever are frequently talked about by those who suffer from severe symptoms, even after standard treatment.

Why Some Patients Consider It

Patients might inquire about hayfever injections since they're seeking relief during a challenging pollen time.

The attraction is often centered around convenience and the possibility of lessening symptoms of the season without taking daily medications.

When It May Be Discussed

Discussions on hay fever injections are usually triggered when the symptoms are severe and haven't responded to standard treatments.

A physician will look at symptoms, medical history, and general suitability prior to discussing possible treatment options.

Limitations to Understand

Although hay fever shots are discussed with regard to the treatment of symptoms, they do not have the intention to build immunity to allergens.

They're not designed to alter the underlying allergic reaction in the same manner that immunotherapy aims to do.

This distinction is crucial in comparing long-term treatment objectives.

How Quickly Does Each Treatment Start Working?

One of the main differences between the two methods is the speed at which benefits be apparent.

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People who are considering treatment may have to weigh short-term symptom control with long-term goals for treatment.

Which Treatment Lasts Longer?

If patients are considering two alternatives, the duration of the benefit is usually an important factor. Allergy immunotherapy is usually an annual treatment plan developed to reduce the sensitivity of an allergic patient over the course of. The goal is to produce lasting changes to the immune system. In general, Hay fever shots are considered to be a part of controlling symptoms during the seasons instead of long-term immunity modification. This is why both treatments are looked at for different goals in treatment.

Which Patients May Be Suitable for Allergy Immunotherapy?

It is typically regarded as a treatment for people who

• Are suffering from moderate to severe hay fever.
• Have you been able to identify an allergy trigger.
• Consistently experience severe symptoms despite conventional treatment.
• Are you ready be able to take on a more extensive treatment program.

Suitability is determined via the clinical examination and allergy testing.

Which Patients Typically Ask About Hay Fever Injections?

Patients who inquire about the use of hay fever shots usually have one or one or:

• These symptoms may hinder the daily routine or work.
• Uncontrolled symptoms despite the use of nasal sprays, antihistamines, or even nasal drops.
• The season is characterized by significant seasonal changes throughout the year.
• Difficulty managing symptoms during peak pollen periods.

Talking about the options for treatment with a doctor will help to determine the best treatment based on your individual needs.

Allergy Immunotherapy vs the Hay Fever Injection: Pros and Cons

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There is no universally superior option. The best approach is based on the severity of the symptom as well as treatment goals and personal medical conditions.

Can Immunotherapy Prevent Future Allergy Progression?

One reason why immunotherapy has gained great interest is the possibility of altering the process of allergic disease.

Studies have suggested that immunotherapy could bring benefits beyond improvement in symptoms. A few studies have investigated its role in slowing the development of allergic diseases and assisting in the long-term improvement of symptoms.

This potential for modifying disease is among the main reasons that distinguish immune therapy from therapies that focus solely on the control of symptoms.

However, the outcomes can differ between people, and the decision to treat should be taken following a professional assessment.

Which Approach Is Right for You?

There isn't one treatment that works for everyone suffering from hay fever.

The most effective approach is based on many factors, such as:

• Symptom severity.
• Impact on the quality of life.
• Response to treatments previously received.
• The triggers for allergies have been identified.
• Treatment goals.
• Willingness to be committed to long-term treatment.

Certain patients prefer long-term modifications of their allergic reaction, while others focus on managing symptoms that arise during the pollen season.

A thorough clinical evaluation will help you determine what options for treatment are suitable depending on your specific circumstances.

If your symptoms aren't responding to treatment options, consult a doctor to discuss your options. If you're not sure of the cause of your symptoms, talk to our medical professionals regarding allergy testing and assessment.

Frequently Asked Questions

Is Immunotherapy the Same as a Hay Fever Injection?

No. Immunotherapy is a method to decrease the immune system's sensitivity to certain allergens over the course of time. The injection for hayfever is considered a treatment option that focuses on the management of symptoms, not the process of reducing immune sensitisation.

Which Lasts Longer?

The idea behind immunotherapy is to create a long-term treatment plan that may yield benefits even after treatment has ended. Injections for Hay Fever are usually considered in conjunction with the control of symptoms during the season.

Does Immunotherapy Cure Hay Fever?

It is not often referred to as an effective treatment. It can, however, help alleviate symptoms and offer long-term benefits to some patients.

How Long Does Immunotherapy Take?

The majority of immunotherapy treatments last for about three years but treatment schedules can vary based on the allergen as well as the treatment plan.

Why Does Immunotherapy Require Multiple Appointments?

Immunotherapy is a gradual exposure to allergens as time passes. Numerous appointments ensure that treatment is administered safely and according to the proper timetable.

Is Allergy Testing Needed Before Immunotherapy?

In the majority of instances, there is. The identification of the particular allergen that causes the symptoms is an important aspect of preparing an immunotherapy plan.

Can Immunotherapy Reduce the Need for Medication?

Many patients notice they depend less on allergy medications after successful therapy for immunotherapy. The results of each patient are different, and any modifications to medications should be discussed with your medical expert.

How Does Immunotherapy Change the Immune System?

Immunotherapy involves continual exposure of the immune system to very controlled amounts of an allergen. Over time, this could lessen the immune system's capacity to become overly reactive when exposed to an allergen.