The coldest day since 2010 has been recorded in the UK, with weather warnings in place across much of the country, but what impact do these temperatures have on our bodies?
Doctors have explained what some of the reactions we have to weather mean, and why we do them, from shivering to a runny nose. Some are nothing to worry about, but others can be more severe, like frostbite and hypothermia.
It's always important to wrap up warm if you're planning to leave the house in sub-zero temperatures. Wearing items like gloves and extra thick socks to protect your extremities can make a huge difference.
