【警告】これから1週間の日本、体調不良者が続出する模様…
A warning about a potential surge in people feeling unwell across Japan over the next week is gaining attention. Rapid weather changes and common seasonal ailments are believed to be the culprits, sparking discussions online. Many are sharing similar experiences and seeking preventive measures, so please take care of yourselves and don't overexert.
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Meteorological Sickness (Weather Pain)
Meteorological sickness, also known as 'weather pain,' refers to a collection of symptoms where changes in meteorological elements such as atmospheric pressure, temperature, and humidity affect the body, leading to various ailments like headaches, dizziness, joint pain, and general fatigue. It is particularly common for symptoms to worsen when low-pressure systems approach. Although the exact mechanism is not fully understood, the most widely accepted theory suggests that hypersensitive sensors in the inner ear, which detect atmospheric pressure changes, relay this information to the brain, disrupting the balance of the autonomic nervous system. Since the autonomic nervous system controls most vital activities like body temperature regulation, respiration, and digestion, its imbalance manifests as a wide range of physical symptoms.
Japan, with its distinct four seasons, tends to see an increase in sufferers during periods of significant weather changes, such as seasonal transitions, the rainy season, and typhoon season. For instance, one survey reported that approximately 60% of Japanese adults experience some form of physical discomfort due to weather changes. Effective preventive measures include maintaining a regular lifestyle, getting sufficient sleep, engaging in moderate exercise, and warming the body with warm drinks or baths to regulate the autonomic nervous system. Recently, apps that predict individual health changes in conjunction with weather forecasts have emerged, helping people understand the relationship between their own health and the weather to alleviate symptoms. This 'warning' may also indicate a potential rise in meteorological sickness cases.
Temperature Difference Fatigue
Temperature difference fatigue refers to a state of fatigue experienced when the body expends excessive energy trying to adapt to significant temperature fluctuations within a day or over several days. This is particularly noticeable in seasons like early spring or autumn, when the temperature difference between morning/evening and daytime often exceeds 10°C. The human body tries to maintain a constant core temperature through the autonomic nervous system to respond to external temperature changes. Specifically, it consumes energy to regulate body temperature by, for example, dilating blood vessels to release heat when it's hot, and constricting them to retain heat when it's cold.
When this temperature regulation is frequently and abruptly required, the autonomic nervous system remains constantly active, placing a heavy burden on it. This can lead to an imbalance in the autonomic nervous system, causing various fatigue symptoms such as general malaise, sluggishness, stiff shoulders, headaches, cold sensitivity, and poor sleep quality. For instance, it has been pointed out that the number of people experiencing temperature difference fatigue is increasing in recent years, partly due to the urban heat island phenomenon, which makes night-time temperatures less likely to drop, leading to larger temperature differences between morning and evening. Effective countermeasures include adjusting body temperature frequently with layers of clothing, maintaining a balanced diet, engaging in moderate exercise to train the autonomic nervous system, and promoting blood circulation by warming the body with a bath.
Japan Meteorological Agency's Long-Range Forecasts
The long-range forecasts issued by the Japan Meteorological Agency (JMA) typically include one-month, three-month, warm-season (spring to summer), and cold-season (autumn to winter) forecasts, predicting trends in temperature, precipitation, and sunshine hours several weeks to months in advance. These forecasts are not merely weather predictions but serve as crucial information sources for socioeconomic activities, people's lives, and especially health management. For example, if a higher-than-average temperature is predicted, measures against heatstroke are encouraged; if a lower temperature is predicted, vigilance against infectious diseases like influenza or hypothermia is advised.
The current 'warning' about a surge in people feeling unwell is highly likely to be based on the JMA's long-range or short-term (e.g., weekly) forecasts, which anticipate rapid temperature changes or the passage of strong low-pressure systems. For instance, if a forecast predicts that 'temperatures will drop significantly below average this week, then rise sharply,' it is directly linked to an increase in temperature difference fatigue and meteorological sickness. JMA's forecasts are created using observational data from weather satellites, radar, AMeDAS, and numerical weather prediction models run on supercomputers, with accuracy improving year by year. This allows the public to prepare in advance, helping to mitigate health damage and aid in disaster countermeasures.