When temperatures reach the levels observed in many parts of the country, some people may have The over 65s, young children and those with heart and lung diseases can all experience tension when temperatures are so high.
But even for those who are in In form and in good health, a level four warning may indicate difficulties.
Mike Wade, Assistant Director of Health Protection, PHE South West, provided some guidance on how to for which hot weather can be a health risk.
He said: "We know that at this time of year, many people will come to the Southwest to enjoy the coast, the scenery and the outdoor activities that are right for them. Offered, and Enjoying the Good Weather.
"But we know that when such temperatures reach, over more than a day or two, can be really uncomfortable and pose a significant health risk.
" It's because their bodies may have a hard time adapting to work harder, as all of our bodies do when it's hot, and they can become sick.
"It is vitally important The good news is that the heat wave may come back in late July and the Met Office says," Temperatures should be above average. "
] The British summer returns but fortunately not for long.
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