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What are the signs of heatstroke?

Heatstroke symptoms include headache, dizziness, flushed or paler skin, rapid breathing, disorientation, nausea or vomiting, and high internal body temperature, often exceeding 104 °F (40 °C). Those experiencing any of these symptoms should seek medical help immediately, as heatstroke is the most severe heat-related illness and can be life-threatening if not treated properly.