Heatwaves, or heat and hot weather that can last for several days, can have a significant impact on society, including a rise in heat-related deaths. Heatwaves are among the most dangerous of natural hazards, but rarely receive adequate attention because their death tolls and destruction are not always immediately obvious. A found that from 2000–2019 approximately 489 000 heat-related deaths occurred each year, including more than 70 000 who died during the 2003 heatwave in Europe. Population exposure to heat is increasing due to climate change. Globally, extreme temperature events are observed to be increasing in their frequency, duration, and magnitude. Between 2000 and 2016, the number of people exposed to heatwaves increased by around 125 million. While the effects of heat may be exacerbated in cities, due to the urban heat island (UHI) effect, the livelihoods and well-being of non-urban communities can also be severely disrupted during and after periods of unusually hot weather. Heatwaves can burden health and emergency services and also increase strain on water, energy and transportation resulting in power shortages or even blackouts. Food and livelihood security may also be strained if people lose their crops or livestock due to extreme heat., The health impact of a heatwave depends on the intensity and duration of the temperature, the acclimatization and adaptation of the population, and the infrastructure and preparedness. Exposure to heat causes severe symptoms, such as heat exhaustion and heat stroke – a condition which causes faintness, as well as dry, warm skin, due to the , Do the following to keep cool during a heatwave: Use light and loose-fitting clothing and bed linens. In order to avoid heat accumulation, do not use cushions. Take cool showers or baths. Wet your skin using a damp cloth, a spray bottle, or wet clothing. Drink water regularly (1 cup of water per hour and at least 2–3 litres per day)..