NewsHealthMet OfficeAs temperatures soar during the UK heatwave, learn to recognise the warning signs and symptoms of heat exhaustion and heatstroke - and when to seek urgent medical help08:39, 26 Jun 2026A fierce heatwave is sweeping across the UK this week. For only the second time in history, a Met Office red warning for extreme heat is in place for parts of England and Wales.‌As temperatures edge towards 40C, it's crucial to understand the distinction between heat exhaustion and heatstroke.‌The consequences are very real. On Wednesday, the London Ambulance Service recorded its highest-ever number of life-threatening emergencies "driven by the extreme heat," reports the Express.‌Part of staying safe is recognising the warning signs - and differences - between these two conditions.Difference between heat exhaustion and heatstrokeBoth conditions are forms of heat-related illness. The most severe of the two is heatstroke, which can be potentially life-threatening.Anybody can fall victim to heat illness during hot weather, though certain groups are particularly vulnerable, including:‌Older peopleBabiesYoung childrenPeople with long-term health conditions like diabetes or heart problems.Here's how to spot the signs and what to do should you or someone nearby be affected.‌What is heatstroke?Heatstroke occurs when the body's ability to regulate its temperature is overwhelmed by heat, leading to reduced blood flow and damage to vital organs. The NHS is urging anyone displaying symptoms of heatstroke to seek urgent medical attention.Heatstroke symptoms can include:High body temperature or fever – usually more than 40CFainting or losing consciousnessA seizure or fitSevere difficulty breathing – for example, struggling to speak without pausing, gasping or chokingConfusionLack of coordinationSkin that’s cold to the touch, even with a high body temperatureArticle continues belowWhat is heat exhaustion?Heat exhaustion occurs when your body overheats — essentially when it loses excessive quantities of water and salt, typically through perspiration. Fatigue, muscle cramps and heat rash are amongst the telltale signs of the condition.The symptoms are generally identical in both children and adults, although youngsters may also display unusual behaviour. NHS Inform has outlined the following symptoms of heat exhaustion:TirednessWeaknessFeeling faintHeadacheMuscle crampsFeeling or being sickHeavy sweatingFeeling very thirstyHeat rashChoose Daily Mirror as a 'Preferred Source' on Google News for quick access to the news you value.‌NHSMet OfficeHeatwaveHealthy LifestyleHealth