Overview
Hay fever, medically known as allergic rhinitis, is an allergic reaction that affects the nose and sinuses. It happens when the immune system overreacts to allergens such as pollen, dust mites, pet dander, or mold spores, leading to inflammation in the nasal passages. Despite the name, hay fever is not caused by hay and does not produce a fever. It’s a very common condition that can significantly affect daily life, especially during allergy seasons.

Why It’s Important
While hay fever is not life-threatening, it can greatly reduce quality of life by disrupting sleep, concentration, work, and school performance. If left unmanaged, it may worsen asthma symptoms or contribute to sinus infections. Because it affects such a large portion of the population, effective prevention and treatment strategies are crucial for maintaining daily well-being.

Quick Facts

• Affects up to 20–30% of adults and 40% of children worldwide

• Can be seasonal (linked to pollen) or perennial (year-round, triggered by indoor allergens)

• Often begins in childhood or adolescence, though it can appear at any age

• More common in people with asthma or a family history of allergies

What Happens in the Body
When someone with hay fever is exposed to allergens, the immune system mistakenly identifies them as harmful. This triggers the release of histamine and other chemicals, causing inflammation in the nasal passages, eyes, and throat. The result is sneezing, congestion, and itchy, watery eyes.

Common Signs and Symptoms

• Sneezing

• Runny or stuffy nose

• Itchy eyes, nose, or throat

• Watery, red eyes

• Postnasal drip (mucus in the throat)

• Fatigue or difficulty sleeping due to congestion

Diagnosis

• Review of symptoms and medical history

• Physical exam of nasal passages

• Allergy testing (skin prick test or blood test) to identify specific triggers

• Often diagnosed based on seasonal patterns or exposure history

Treatment and Management

• Medications: Antihistamines, nasal corticosteroid sprays, decongestants, leukotriene inhibitors

• Lifestyle changes: Limiting exposure to triggers (closing windows during pollen season, using air purifiers, washing bedding regularly)

• Allergen immunotherapy (allergy shots or tablets) for long-term desensitization in moderate to severe cases

• Saline nasal rinses can also help reduce symptoms

Risks and Complications

• Poor sleep leading to daytime fatigue

• Increased risk of sinus infections

• Worsening of asthma symptoms

• Reduced productivity and school/work performance

Who Is at Risk

• People with a family history of allergies, asthma, or eczema

• Individuals exposed to high levels of pollen, dust, or pet dander

• Children and adolescents (though it can persist into adulthood)

• People with other allergic conditions (eczema, food allergies)

Related Conditions

• Asthma

• Eczema (atopic dermatitis)

• Sinusitis (chronic sinus infections)

• Conjunctivitis (allergic pink eye)

When to See a Doctor
Seek medical care if hay fever symptoms become severe, persistent, or interfere with daily activities or sleep. Immediate medical help is needed if you have difficulty breathing or notice worsening asthma symptoms.

Last Updated: October 2, 2025