This WHO fact sheet outlines how climate change is intensifying extreme heat and increasing health risks worldwide. Rising temperatures are linked to heat-related illnesses, including heatstroke and cardiovascular complications, especially among vulnerable populations such as the elderly, children, and outdoor workers. The page highlights the need for heat-health action plans, early warning systems, and long-term climate adaptation strategies. It also emphasizes the importance of urban planning, access to cooling, and public awareness to reduce preventable heat-related deaths and illnesses. The fact sheet serves as a crucial resource for governments, health professionals, and communities facing growing heat challenges.