Pollen allergies, particularly from cedar and cypress trees, have become a significant health concern in Japan, often referred to as a 'national disease' due to their widespread impact, affecting around 40% of citizens. The article details how pollen allergies lead to reduced productivity, increased economic losses, and overall lower quality of life. The prevalence of these allergies has increased over the last 60 years, with a sharp rise from 20% of the population affected in 1998 to 40% by 2019. The historical context of this issue emphasizes changes in Japan's forestry practices over decades. After World War II, the reconstruction efforts led to a boom in the planting of fast-growing coniferous trees like cedar, which inadvertently contributed to the worsening pollen problem. The article notes that while Japan's artificial forests grew from approximately 5 million hectares to about 10 million hectares since the late 1940s, the difficulty of managing the cedar population, largely due to the decline in domestic timber production due to cheaper imports, has compounded the issue. Large-scale pollen dispersion occurs as these trees mature, particularly those over 20 years old. Moreover, the Ministry of the Environment and the Forestry Agency conduct annual surveys of cedar forests across Japan to monitor pollen production. By examining the number of male flowers, which are responsible for pollen dispersal, officials can predict pollen levels for upcoming seasons. The article highlights collaborative efforts to address this health crisis, suggesting that improving awareness and proactive measures can potentially alleviate the burden of pollen allergies in the affected population.