When it leads to heat stroke, it will cause swelling in the lower limbs, heat rash on the neck, cramps, headache, irritability, lethargy and weakness.
Doctor Bharat Pankhania, a senior clinical lecturer at the University of Exeter Medical School, explained: “When your body temperature rises and rises, your system starts to go into a vicious cycle.
“You get cardiac insufficient, brain insufficient, and there aren’t enough fluids.
“If you haven’t kept hydrated, your blood gets sticky and that sticky blood forms clots.