Heat Index and Heatstroke: Essential Safety Tips for Hot Climates

From a biological perspective, air temperature alone does not fully determine how heat affects the human body. Humidity also plays a major role — and in places like Phuket, it is consistently high.

Because of this, medical professionals and meteorologists use the concept of the heat index, which reflects how hot the weather actually feels to the body by combining temperature and humidity. In Phuket, this показатель can reach up to 50°C, placing it near the highest danger levels.

Health authorities recommend several key measures to prevent heatstroke:

• Avoid staying in the heat for long periods, especially under direct sunlight.

• Stay properly hydrated and maintain electrolyte balance by drinking around 2–3 liters of water daily.

• Choose lightweight, breathable clothing in light colors, and always wear a hat or other head protection.

• Refrain from consuming alcohol during hot weather.

  
  

Doctors emphasize that heatstroke does not occur instantly, which makes it important to recognize early warning signs. The initial stage, known as heat exhaustion, may present with heavy sweating, rapid heartbeat, weakness, headaches, nausea, and dizziness.

More severe symptoms indicating heatstroke include:

• Body temperature reaching 40°C

• Redness of the skin, especially on the face

• Cessation of sweating despite extreme heat

• Intense thirst

• Dizziness

• Rapid breathing and lack of oxygen

• Nausea and vomiting

• Confusion or loss of consciousness

  
  

Paradoxically, one of the most dangerous signs is the absence of sweating, which indicates that the body’s natural cooling system has failed.

In Thailand, the emergency medical number is 1669. If symptoms of heatstroke appear on the beach, lifeguards can provide immediate assistance and contact emergency services if necessary.