When Is Allergy Season in Korea?

Korea has more than one allergy season

Allergic rhinitis is inflammation of the nasal lining triggered by the immune system reacting to harmless substances, called allergens. In Korea, the timing of symptoms depends on which allergen you react to. Exact dates shift each year with temperature and rainfall, so these are general patterns.

Seasonal patterns in Seoul

Spring (about March to May): tree pollen, including oak, birch, alder, pine, and others. This is when many people notice sneezing and itchy eyes for the first time. Pine pollen is very visible as yellow powder but is generally a weaker allergen than oak or birch.
Late spring to early summer: grass pollens.
Late summer to autumn (about August to October): weed pollens such as ragweed, mugwort, and Japanese hop.
Year-round: house dust mites, pet dander, cockroach, and mold. Dust mite symptoms often worsen in winter when windows stay closed and bedding is heavier.
Spring dust events: yellow dust and fine dust are not allergens themselves, but they irritate the nose and can worsen allergy symptoms.

Why expats sometimes develop allergies after moving

People who never had hay fever at home sometimes develop it after a year or two in Korea. New exposure to local pollen types can sensitize the immune system. Others who were allergic at home find symptoms change because the local plants are different.

Symptoms of allergic rhinitis

Repeated sneezing, especially in the morning
Clear, watery runny nose
Itchy nose, eyes, or roof of the mouth
Nasal congestion and postnasal drip
Fatigue and poor sleep during peaks

What we do at Gangnam Yonsei ENT

Knowing exactly what you are allergic to makes treatment far more effective. An allergy test identifies which pollens, mites, or animals trigger your symptoms. Dr. Kim Yoo Suk, a member of the Korean Academy of Asthma, Allergy and Clinical Immunology and a former Yonsei clinical assistant professor, follows ARIA guideline-based care: avoidance, medication, and, in selected cases, surgery or immunotherapy.

Common treatments include steroid nasal sprays, antihistamines, and other allergic rhinitis medications. For people with house dust mite allergy, sublingual immunotherapy is a daily under-the-tongue tablet that aims to reduce sensitivity over time. When swollen turbinates keep the nose blocked despite medication, turbinate reduction may be discussed.

Practical tips for allergy season

Start your prescribed nasal spray one to two weeks before your usual season begins.
Keep windows closed on high pollen days and use an air purifier.
Shower and change clothes after time outdoors.
Rinse your nose with saline in the evening.

When to see an ENT

See a doctor if over-the-counter antihistamines are not enough, if you have wheezing or shortness of breath, or if symptoms affect sleep and work. English consultations are available near Gangnam-gu Office Station; see location and hours. Related: whether dust mite immunotherapy is worth it and how fine dust affects your nose.

Is pine pollen a major cause of allergies in Korea?

Pine pollen is very visible in spring but is usually a weaker allergen than oak or birch pollen, which peak around the same time. An allergy test can show which specific pollens actually trigger your symptoms.

Can I develop allergies after moving to Seoul?

Yes. Adults can become sensitized to new local pollens or indoor allergens after a year or more of exposure. If you develop seasonal sneezing and itchy eyes for the first time, allergy testing can clarify the cause.

When should I start allergy medication before the season?

Steroid nasal sprays work best when started one to two weeks before your usual symptoms begin and used daily through the season. Antihistamines act faster and can be added on high pollen days as needed.

Gangnam Yonsei ENT Clinic

When Is Allergy Season in Korea? An ENT in Gangnam, Seoul Explains