tekko

大辞林
花粉によって粘膜が刺激されて起こるアレルギー。結膜炎・鼻炎・喘息などの症状が見られる。
原因として春先のスギ・ヒノキ、初夏のオオアワガエリ、秋のブタクサ・ヨモギなどの花粉が知られている。枯草熱(こそうねつ)。

Wiki
Hay fever
Hay fever is caused by pollens of specific seasonal plants and airborne chemicals and dust particles in people who are allergic to these substances. It is characterised by sneezing, runny nose and itching eyes. This seasonal allergic rhinitis is commonly known as 'hay fever', because it is most prevalent during haying season. It is particularly prevalent from late May to the end of June (in the Northern Hemisphere). However it is possible to suffer from hayfever throughout the year