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What is the most common allergy in Japan?


Japan is a beautiful country that is known for its rich culture, stunning landscapes, and delicious cuisine. However, like any other place in the world, Japan has its fair share of health issues. One of the most common health problems in Japan is allergies. Allergies are a major concern for many people living in Japan, and it’s essential to understand the most common allergies so that you can take steps to avoid them.

What Causes Allergies?

Allergic reactions occur when the immune system overreacts to something that is typically harmless. The immune system produces antibodies that cause a release of histamine and other chemicals, which can lead to symptoms such as sneezing, itching, and swelling. In Japan, allergies are caused by various factors such as pollen, dust mites, mold spores, and animal dander.

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The Most Common Allergy in Japan

The most common allergy in Japan is hay fever or pollinosis. It is estimated that one in five Japanese people suffer from this allergy. Hay fever is triggered by pollen from trees such as cedar, cypress, and oak, which are prevalent in Japan. The symptoms of hay fever include sneezing, runny nose, itchy eyes, and throat irritation.

How to Avoid Pollen Allergies

To avoid pollen allergies in Japan, it’s essential to know the times of the year when pollen levels are highest. In general, pollen levels are highest from February to May. During these months, it’s recommended to stay indoors as much as possible during peak pollen hours (usually mid-morning to early afternoon). Wearing a mask can also help reduce exposure to pollen.

Dust Mite Allergies

Dust mites are tiny insects that thrive in warm and humid environments. They are a common allergen in Japan, and their presence can cause symptoms such as sneezing, runny nose, and itchy eyes. Dust mites are found in mattresses, pillows, carpets, and upholstery.

How to Avoid Dust Mite Allergies

To avoid dust mite allergies in Japan, it’s essential to keep your living space clean and dry. Use a dehumidifier to reduce humidity levels, and wash your bedding regularly in hot water. Avoid using down-filled pillows and comforters, as they can harbor dust mites.

Mold Allergies

Mold is a type of fungus that thrives in damp and humid environments. It’s a common allergen in Japan, especially during the rainy season. Exposure to mold can cause symptoms such as coughing, wheezing, and chest tightness.

How to Avoid Mold Allergies

To avoid mold allergies in Japan, it’s essential to keep your home clean and dry. Fix any leaks or water damage promptly, and use a dehumidifier to reduce humidity levels. Avoid keeping damp items such as towels or clothes in closed spaces.

Animal Dander Allergies

Animal dander is tiny flakes of skin shed by animals such as dogs and cats. It’s a common allergen in Japan, and exposure to animal dander can cause symptoms such as sneezing, runny nose, and itchy eyes.

How to Avoid Animal Dander Allergies

To avoid animal dander allergies in Japan, it’s essential to limit exposure to pets. If you have a pet, keep them out of the bedroom and off furniture. Use an air purifier with a HEPA filter to reduce airborne allergens.

Food Allergies

Food allergies are also a concern in Japan, especially for those with seafood allergies. Japan is known for its delicious seafood, and many dishes contain ingredients such as shrimp, crab, and fish.

How to Avoid Food Allergies

To avoid food allergies in Japan, it’s essential to read food labels carefully and ask about ingredients before ordering food. If you have a severe allergy, carry an epinephrine auto-injector with you at all times.


Allergies are a common health concern in Japan, but with proper knowledge and precautions, they can be managed. By understanding the most common allergens and taking steps to avoid them, you can enjoy all that Japan has to offer without worrying about allergy symptoms. Remember to consult with a medical professional if you experience severe allergic reactions.

What are most Japanese people allergic to?

The specific pollens that cause allergic reactions are Japanese cedar, Hinoki cypress, and pine trees. The majority of individuals who experience a reaction are affected by Japanese cedar pollen. This information was reported as of January 20th, 2023.

What are common allergens in Japanese food?

In Japan, common allergenic foods include eggs, milk, wheat, buckwheat, peanuts, shrimp, and crab. Some of these allergens may be referred to by different names, such as “落花生” and “ピーナッツ,” which both mean peanuts. This information was last updated on February 1st, 2018.

What is the #1 most common allergy?

Children are most commonly allergic to milk, egg, and peanut, while adults are most commonly allergic to shellfish, peanut, and tree nut.

Who has the rarest allergy in the world?

Aquagenic urticaria, also known as a water allergy, is an extremely rare and strange allergy that causes individuals to experience painful rashes and hives upon exposure to water, regardless of its temperature or purity.

Is pollen allergy common in Japan?

The percentage of people in Japan experiencing pollen allergies has increased from 20% two decades ago to approximately 40% in 2019. The Tokyo Metropolitan Government is advising individuals with hay fever to take proactive measures to minimize symptoms, as the pollen count is predicted to be 2.7 times higher this year compared to the previous spring.

What is the allergy tree in Japan?

Japanese Cedar, also known as sugi, is responsible for the majority of hay fever cases in Japan, causing symptoms such as sneezing, sore eyes, and runny noses in 70% of those affected. Out of the approximately 60 types of plants that cause hay fever in Japan, Japanese Cedar is considered the most problematic.

It’s important to note that allergy testing is available in Japan, and it’s recommended for those who experience persistent allergy symptoms. Allergy testing can help identify the specific allergens that trigger your symptoms, allowing you to take targeted steps to avoid them.

In addition to avoiding allergens, there are also medical treatments available in Japan for allergies. Over-the-counter antihistamines and nasal sprays can help alleviate symptoms such as sneezing and runny nose. For more severe allergies, a doctor may prescribe immunotherapy or allergy shots, which can help reduce sensitivity to allergens over time.

It’s also worth noting that Japan has a culture of wearing masks during times of illness or high pollen count. While masks may not completely prevent exposure to allergens, they can help reduce the amount of pollen, dust, or other allergens you breathe in.

Overall, while allergies can be a concern in Japan, understanding how to avoid common allergens and seeking medical treatment when necessary can help manage allergy symptoms and allow you to fully enjoy all that Japan has to offer.

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