Hay fever is said to be the national disease of Japan,
It was learnt in Kaihei Koso's Hay fever and human beings that it was thought to be a disease peculiar to Britain and the United States before. In the early 19th century, when the cause was not even known, there was an academic report by a British doctor who suffered from symptoms himself ▼ Every June, the eyelids began to heat up, and "I was attacked by severe itching and pain, and I felt as if a small part with an eyeball was stabbed or pierced..." It becomes clear before long that grass pollen is a cause, too, and the theory according to the heat and the neurosis that it is ineffective has come out even if it tried the lowering agent and fasting, etc. In the background, pastures increased due to the reclamation of wastelands. Ragsa pollen afflicted people in the United States.
No matter how much pollen is hated that the vacant lot born in various places by the urban development invited the advancement of this plant, it will go to people's activities. Cedar pollinosis in Japan is also a result of the postwar tree planting policy. I'd also like to see a move to increase pollen-free cedar, but it will take time.