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Information bulletin
Prevention of thermal shock in the lakes of Haute-Savoie
Automatically translated from French ·
Published on Friday, August 14, 2026 at 11:44 AM
The Haute-Savoie department warns of the risk of thermal shock during swimming in lakes and rivers. Safety tips are being distributed to prevent accidents, including entering the water gradually and avoiding alcohol and heavy meals before swimming.
Emergency instructions
In case of warning signs: make hand gestures, exit the water quickly, warm up. If symptoms persist, call for help.
The Haute-Savoie Department reminds people of the precautions to take when swimming safely during the summer season.
Risks related to thermal shock
- Thermal shock, or hydrocution, occurs when entering cold water too quickly after being exposed to the sun.
- It may cause loss of consciousness in the water, leading to a risk of drowning.
Safety instructions
- Enter the water gradually, especially if the water is cold.
- Avoid prolonged sun exposure before swimming.
- Do not consume alcohol or eat a heavy meal before swimming.
- Take into account your physical condition before entering the water.
Warning signs
- Shivering, cramps, visual or auditory disturbances, headaches, extreme fatigue.
- If you experience symptoms: make hand gestures, exit the water quickly, and warm up.
- If signs persist, call emergency services immediately.
Additional precautions
- Choose supervised swimming areas.
- Stay vigilant with children, even in supervised zones.
- Learn to swim at a young age, under the supervision of a swimming instructor.
- Inform your close ones of your swimming location.
- Obey swimming zone flags and instructions from lifeguards.
For more information: www.sports.gouv.fr/se-baigner-en-toute-securite-prevention-des-noyades-602
Updated on 06/29/2026
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