花粉症（かふんしょう、kafunshou）
- hay fever

The word 花粉症 （かふんしょう） refers to “hay fever” or “pollen allergy” in English. It's a seasonal allergic reaction triggered by pollen, typically from trees, grasses, or weeds. Symptoms include sneezing, runny nose, itchy eyes, and other allergic reactions. People who suffer from 花粉症 experience these symptoms during the pollen season, usually in the spring.

⚫︎ 私は春になると花粉症になります。 Translation: I get hay fever in the spring. ⚫︎ あの人はひどい花粉症で、いつもマスクをしています。 Translation: That person has severe hay fever and always wears a mask. ⚫︎ 花粉症の薬を飲みましたか？ Translation: Did you take your hay fever medicine?

You use 花粉症 （かふんしょう） to describe the condition of having hay fever. You can use it when talking about your own symptoms, describing someone else's symptoms, or discussing treatments or preventative measures. You can also use it to ask about someone's condition.

花粉症 （かふんしょう） is typically written with the kanji 花粉 combined with the kanji 症. ⚫︎ 花粉 means "pollen." ⚫︎ 症 means "symptom" or "disease." The reading is かふんしょう in hiragana. There are no other common ways to write this word. The okurigana is standard, with no variations.

There aren't any direct synonyms for 花粉症 in Japanese, as it is the standard term. However, you might use more descriptive phrases to explain the symptoms or severity: ⚫︎ アレルギー性鼻炎（アレルギーせいびえん）：allergic rhinitis, a more formal term for the inflammation of the nasal passages due to allergies, which is often caused by 花粉症. ⚫︎ 花粉アレルギー（かふんアレルギー）：pollen allergy

There is no direct antonym.

今年は花粉症の症状が去年よりひどいです。 ・Translation: This year, my hay fever symptoms are worse than last year. ・Explanation: This sentence describes the severity of the symptoms of 花粉症, comparing it to the previous year.

花粉症の薬は、症状を和らげるのに役立ちます。 ・Translation: Hay fever medicine helps to alleviate the symptoms. ・Explanation: This sentence explains the use of medicine to help someone with 花粉症.

The word 花粉症 （かふんしょう） is a compound word. 花粉 (pollen) is combined with 症 (symptom/disease), thus literally meaning "pollen sickness" or "pollen syndrome," accurately reflecting the condition's cause and effects. The term was coined in Japan to describe the seasonal allergic reaction to pollen, primarily from cedar trees, which is very common in Japan.