Cold Water Shock

Understanding Cold Water Shock

Cold water shock is a sudden and involuntary response that can occur when the body is immersed in water below 15°C which is a common temperature in Welsh rivers, lakes, reservoirs, and coastal waters. This reaction can cause an immediate gasp reflex, rapid breathing, and a spike in heart rate and blood pressure, which may lead to panic and inhalation of water. These effects can overwhelm even strong swimmers. It’s important to remember that the danger isn’t just about swimming ability it’s about how your body reacts to the cold.

What You Can Do

If you fall into cold water, your instinct may be to swim hard or thrash about, but this can increase the risk of drowning. Instead, fight that urge and try to stay calm and remember to Float to Live

• Tit your head back submerging your ears
• Relax and control your breathing
• Move your hands and legs to help you stay afloat
• Your legs may sink – That’s OK everyone floats differently

Once the initial shock has passed, look for ways to call for help or get to safety. Practice floating next time you’re at a supervised location like a swimming pool.  

If you're entering cold water intentionally, such as for outdoor swimming or water sports, enter the water slowly, wear appropriate thermal protection like a wetsuit or drysuit, and consider using a personal flotation device.

Planning ahead and knowing how to respond can save your life and the lives of others.