Rising Concern: Foreigners and Heatstroke in Japan

Did you know that three out of four foreigners living in Japan have experienced heatstroke? The number of people rushing to hospitals due to heat-related illnesses is increasing, even indoors. Many don't know about Japan's humid summers or how to prevent heatstroke. This applies to both residents and tourists, especially those not used to Japan's climate. With more visitors expected in summer, it's vital to raise awareness about staying safe from heatstroke.

Here are heatstroke prevention products commonly sold at drugstores and convenience stores

Electrolyte drinks

Replenish lost fluids and minerals with electrolyte drinks like sports drinks or oral rehydration solutions.


出典：大塚製薬 ポカリスエット 公式サイト

POCARI SWEAT

POCARI SWEAT is a health drink formulated to mimic the natural fluid balance of the human body by containing a balanced mix of ions, also known as electrolytes. It efficiently replenishes the water and ions your body requires, providing refreshment to every part of you.

出典：大塚製薬 OS-1公式サイト

Oral Rehydration Solution OS-1

Oral Rehydration Solution OS-1 is a type of oral rehydration fluid used for dietary therapy in cases of dehydration. It is formulated to replenish and maintain water and electrolytes in patients with mild to moderate dehydration.
OS-1 follows the principles of oral rehydration therapy advocated by the World Health Organization (WHO) and is based on guidelines from the American Academy of Pediatrics that have advanced the concept of oral rehydration therapy.

It is designed to provide effective hydration and electrolyte balance for those experiencing dehydration, offering a convenient and medically-approved solution for rehydration.

What is salt charge tablet?

A salt charge tablet is a type of oral supplement designed to replenish electrolytes, particularly sodium, in the body. These tablets are often used to replace salts lost through sweating during exercise, hot weather, or illness. They typically contain a combination of sodium chloride (table salt) and other electrolytes like potassium and magnesium, along with carbohydrates for energy. Salt charge tablets are dissolved in water and consumed orally to help maintain proper hydration and electrolyte balance, especially during periods of increased physical activity or fluid loss.


出典：カバヤ 塩分チャージタブレッツ

Kabaya Enbun Charge Tablets

Kabaya Enbun Charge Tablets are nutritional supplements designed to conveniently replenish salt and minerals. These tablets contain ingredients aimed at efficiently restoring lost salts and minerals in the body, particularly after exercise or intense sweating when there is a concern for fluid and mineral loss.

These tablets are easily consumed by dissolving them in water. They come in convenient sizes for portability, making them ideal for use on-the-go, such as during outdoor activities or sports events. Additionally, they are formulated with palatable flavors and are effective for quickly providing the necessary salt replenishment when needed.

Kabaya Salt Charge Tablets are not only beneficial for athletes and sports enthusiasts but also for outdoor enthusiasts and individuals with high activity levels in their daily lives as a useful nutritional supplement.

Instant cooling pack

An instant cooling pack is a portable, convenient solution for quickly cooling down without the need for ice. It typically consists of a flexible pouch containing a cooling gel or solution. When activated, the pack rapidly lowers in temperature, providing instant relief for various purposes such as first aid for injuries, sports recovery, or simply beating the heat on a hot day.
To use an instant cooling pack, you usually just need to squeeze or shake it to activate the cooling process. Some packs may require breaking an inner pouch or snapping a metal disc inside to start the cooling reaction. Once activated, the pack remains cold for a certain period, offering a refreshing sensation wherever and whenever needed.
Instant cooling packs are versatile and widely used in various situations, including outdoor activities, medical emergencies, and everyday cooling needs. They are lightweight, portable, and easy to use, making them an essential item for anyone seeking quick relief from heat or discomfort.

出典：ロッテ ヒヤロン

Hiyaron

Hiyaron is an instant cooling pack that can rapidly chill without the need for ice. It's a squeeze-type pack, so there's no need to vigorously shake or hit it, making it easy for anyone to use.

Inside the pack are granular cooling agents and a water pouch. To activate the cooling effect: (1) Place the pack on a flat surface and firmly squeeze the center with your fist to rupture the water pouch inside. (2) Once the water pouch is ruptured, the granular cooling agents dissolve in the water, initiating the cooling process.

This holds true not only for resident foreigners but also for tourists visiting Japan. Particularly at risk are those with limited residency in Japan, individuals from higher latitudes, and visitors from the southern hemisphere where it's winter during Japan's summer. They may not be acclimated to Japan's hot and humid climate, thus facing a higher risk of heatstroke. Considering the anticipated increase in foreign visitors during the summer months, spreading awareness about heatstroke prevention and treatment among resident and visiting foreigners is imperative.

Currently, three out of four resident foreigners have experienced heatstroke. Indeed, the number of foreigners being rushed to medical facilities due to heat-related illnesses is on the rise. It's not just an outdoor issue; cases are also prevalent indoors. Lack of knowledge about Japan's summer humidity and ignorance of heatstroke prevention and first aid methods are cited as significant contributors to this trend.

Explaining the Danger of Japan's Summer

Japan's summer is characterized by not only high temperatures but also oppressive humidity. Even when the thermometer reads below 25°C (77°F), the combination of heat and humidity can make it feel much hotter, increasing the risk of heatstroke. Humidity levels above 70% hinder the body's ability to cool itself through sweat evaporation, leading to overheating and potential heat-related illnesses like heat exhaustion or heatstroke. This means that even on seemingly mild days, individuals need to be vigilant about staying hydrated and avoiding prolonged exposure to the sun to prevent heat-related health issues.

Key Points for Foreigners to Know about Japan's Heat and Heatstroke Prevention

Japan's summer presents a dual challenge of high temperatures and humidity, which can quickly lead to heat-related illnesses like heatstroke. Even when the thermometer reads below 25°C (77°F), the combination of heat and humidity can be dangerous. To combat this, it's essential to take specific measures:

Stay Hydrated
Drink plenty of fluids throughout the day, focusing on water and electrolyte-rich beverages like sports drinks. Carry a reusable water bottle and refill it regularly, especially when outdoors.

Dress Appropriately
Wear lightweight, loose-fitting clothing made of breathable fabrics like cotton or moisture-wicking materials. Opt for light colors that reflect sunlight rather than absorb heat. Consider wearing a wide-brimmed hat and sunglasses for added protection.

Seek Shade
Avoid prolonged exposure to direct sunlight, especially during the hottest parts of the day (usually between 10 a.m. and 4 p.m.). Take frequent breaks in shaded areas or indoors to cool down.

Use Cooling Products
Utilize cooling towels, misting fans, or portable fans to lower body temperature. Traditional Japanese items like uchiwa fans or sudare (bamboo blinds) can also provide relief from the heat.

Plan Outdoor Activities Wisely
Schedule outdoor activities during cooler times of the day, such as early morning or late afternoon. Take breaks in air-conditioned spaces or shaded areas to prevent overheating.

By implementing these measures, individuals can protect themselves from the dangers of Japan's summer heat and enjoy the season safely.

This approach provides actionable steps and examples to help readers better understand how to prevent heat-related illnesses during Japan's summer.

Beating the Heat: Traditional Japanese Remedies for Summer Fatigue

Japan's summer brings intense heat and high humidity, leading to a common issue known as "summer fatigue" or "natsubate." However, Japan has long-established remedies to combat this seasonal problem.

Firstly, foods rich in Vitamin B1 are recommended, such as eel and brown rice. Vitamin B1 is essential for energy metabolism and can help with fatigue recovery and stress relief during the hot summer months.

Additionally, foods containing high levels of citric acid, such as pickled plums (umeboshi) and lemons, are beneficial. Citric acid aids in fatigue recovery and enhances physical stamina, making it a powerful ally against summer heat.


Furthermore, for replenishing salt and minerals, sports drinks are commonly used. These drinks not only hydrate but also replenish lost electrolytes, helping to maintain the body's balance.

These items are well-known in Japan as traditional remedies for summer fatigue and are likely to be beneficial to people worldwide. Derived from Japan's rich culinary traditions, these foods and beverages can help create a body that withstands the heat of summer. Give them a try and beat the summer heat with these time-tested remedies!