Kafunsho (花粉症) is the Japanese term for Japanese pollen allergy or hay fever, and is one of Japan’s most widespread seasonal health concerns.
In Japan, it is extremely common condition affecting an estimated 30-40% of Japanese population. This form of seasonal allergic rhinitis has become increasingly prevalent in recent decades, significantly impacting daily life during peak pollen seasons.
Primary Causes of Japanese Pollen Allergy:
The main triggers of Kafunsho in Japan are Japanese Cedar (Sugi) and Japanese Cypress (Hinoki). Other plants as such as Ragweed, Rice plants, Birch trees and Grass species causes Japanese Pollen Allergy as well. Japanese Cedar Pollinosis is unique to Japan and is considered one of the world’s three major pollen allergies alongside with Ragweed pollinosis common in the US, and grass pollen allergy common in Europe.
The allergy season varies by region and period of time, and the season starts from the Southern region and move up to the North. Japanese Cedar releases pollen in February to April hence spring could be challenging time of the season for those who have Kafunsho.
You can check latest forecasts from Japan Weather Association (JWA) for details.
Historical Background of Japanese Pollen Allergy:
Why is pollen allergy so bad in Japan? The widespread occurance of Kafunsho can trace back to post World War II refosteration efforts. Large numbers of Japanese cedar trees were planted for timber production and these trees are now mature and produces massive amount of pollen. Also, urban development and climate change have increased pollen levels.
Common Symptoms of Japanese Pollen Allergy:
What are the symptoms of pollen allergies in Japan? People suffering from Kafunsho typically experience persistent sneezing, runny or stuffy nose, itchy and watery eyes, throat irritation, fatigue, headaches and skin irritation.
What are the symptoms of being allergic to pollen? Symptoms include itchiness and foreign body sensation, and symptoms tend to worsen in proportion to the amount of pollen in the air. Nasal symptoms make breathing difficult, which can significantly impact studying, work, and household chores due to decreased concentration and difficulty sleeping.
Additionally, some people with hay fever may experience symptoms such as itching, numbness, and swelling of the lips, tongue, mouth, and throat within minutes after eating fruits or raw vegetables. This is called Oral Allergy Syndrome (OAS), which occurs because the allergens (substances that cause allergies) in pollen are similar to those found in fruits and vegetables. This condition significantly affects quality of life and daily activities.
Persistent sneezing and itchy eyes over 3 months sounds like nightmare, but here are some helpful tips.
Prevention and Management of Japanese Pollen Allergy:
Do you notice many people wear masks, eyeglasses and hats in spring time? These items are known as protective gear to prevent pollen attachment on body. Also, Japan has developed various innovative solutions to combat Kafunsho as such as advanced pollen forcasting systems, special anti-pollen fabrics and clothing, pollen-reduced varieties of ceder trees and smartphone apps for pollen alerts.
For daily practices, many people check pollen forecasts, change clothes after returning home, have air purifiers in the room and keep window closed during peak pollen times. As for medical treatments, antihistamines, nasal sprays, eye drops and sublingual immunotherapy options could help you reduce symptoms.
For those who visit during Kafunsho time, consider wearing glasses instead of contact lenses might help.
Economic Impact of Japanese Pollen Allergy:
Kafunsho influences Japanese economy in some way. It increases healthcare costs, creates market for anti-allergy products and provides investment in pollen reduction measures. It can also affect overall quality of life; work performance, school attendance, outdoor activities and sleep quality.
Kafunsho is more than just a minor inconvenience in Japan, it is significant health issue that affects millions of people. While it can not be completely avoided, proper management and prevention can help minimize its effects.
As research continues and new solution emerge, there is a hope for better management of tis widespread condition in the future.
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