Hay fever
Hay fever, also known as allergic rhinitis, is an allergic reaction to outdoor or indoor allergens. It causes cold-like symptoms such as a runny nose, itchy eyes, and sneezing during specific times of the year or year-round.
Overview
Hay fever, also known as allergic rhinitis, is an allergic reaction to outdoor or indoor allergens. It causes cold-like symptoms such as a runny nose, itchy eyes, and sneezing during specific times of the year or year-round.
Understand this condition
When you have hay fever, your immune system mistakenly identifies harmless proteins like pollen as dangerous invaders. It produces antibodies to fight these substances, leading to the release of chemicals like histamine. These chemicals cause inflammation in the lining of your nose, throat, and eyes.
Why it happens
The biological reason is a hypersensitive immune reaction to environmental triggers. Symptoms typically progress shortly after exposure and can worsen if the inflammation becomes chronic. Over time, repeated exposure can make the airways more sensitive to even minor irritants.
Real-world scenarios
- •People may notice sneezing fits every time they mow the lawn.
- •This often appears as itchy, watery eyes during peak spring months.
- •People may experience a stuffy nose only when visiting homes with cats.
- •This often appears as a persistent nighttime cough during high mold seasons.
Common vs serious explanations
- •Seasonal changes in plant pollination cycles
- •Exposure to a new pet or dusty environment
- •High wind carrying pollen from distant areas
- •Spending more time outdoors during peak seasons
- Anaphylaxis, a life-threatening allergic reaction requiring immediate care
- Severe asthma exacerbation causing significant airway narrowing
- Acute bacterial sinusitis requiring antibiotic treatment
- Nasal polyps blocking the airways and requiring surgery
Symptoms
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Causes
- •pollen from trees, grass, or weeds
- •dust mites
- •mold spores
- •pet dander / skin flakes
Risk factors
- •having other allergies or asthma
- •family history of hay fever or eczema
- •living or working in an environment with high allergen exposure
- •allergic sensitization in early childhood
How it progresses
3 stages- OnsetSymptoms appear, often triggered by a known cause.Often missed
- Active phaseSymptoms peak; self-care or short treatment usually helps.
- ResolutionSymptoms ease over days to weeks with proper care.
How it's diagnosed
- •physical examination of nasal passages
- •review of seasonal symptom history
- •allergy skin prick test
- •blood test for specific IgE antibodies
Treatment options
General educational information only — no dosage advice. Always follow guidance from a qualified clinician.
- •over-the-counter antihistamines
- •corticosteroid nasal sprays
- •decongestant medications
- •allergy immunotherapy (shots or tablets)
- •using a saline nasal rinse or neti pot
- •keeping windows closed during peak pollen times
- •showering after being outdoors
- •wearing sunglasses to protect eyes
Complications
- •Reduced quality of life
- •Worsening symptoms over time
- •Recurrence of hay fever
Prevention
- •Maintain a healthy lifestyle
- •See a clinician for routine check-ups
When to seek help
- •Symptoms persist beyond a few days
- •Symptoms interfere with daily activities
- •New or worsening symptoms appear
- •Concerning changes related to hay fever
- wheezing or difficulty breathing
- symptoms that do not respond to medication
- severe facial pain and sinus pressure
- fever or signs of secondary infection
In any emergency, call your local emergency number or go to the nearest emergency department.
Real-world questions
- ›Can Hay fever cause headaches?
- ›Is Hay fever reversible?
- ›How quickly does Hay fever progress?
- ›Is Hay fever hereditary?
- ›Can Hay fever be prevented?
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Frequently asked questions
Possible causes of Hay fever include pollen from trees, grass, or weeds, dust mites, mold spores, pet dander / skin flakes.
Hay fever is generally mild, but severity can vary. Seek care if symptoms are severe or persistent.
Duration varies between individuals. Many cases improve with appropriate care, while others may persist longer and require ongoing management.
Some milder cases may improve with rest and self-care. If symptoms persist or worsen, consult a healthcare professional.
Consider seeing a clinician if symptoms are severe, persistent, worsening, or if you have any concerns related to general.
Sources
Information based on general medical references such as:
Last reviewed: May 2026