How Does Heat Stroke Happen?

Hot surroundings, direct sun, strenuous activity, heavy clothing, or poor air movement can raise body heat. Sweating and increased blood flow to the skin normally release heat. Dehydration, illness, alcohol, certain medicines, very young or older age, and limited access to cooling can reduce that response. Once cooling fails, confusion, fainting, headache, weakness, nausea, or vomiting may appear. Heat exhaustion is a related condition that can precede heat stroke; see Heat Exhaustion for context.

Stop activity and move to a cool place as soon as symptoms begin. Remove excess layers, wet the skin, fan continuously, and use wrapped cold packs at the neck, armpits, and groin. Ask someone to call emergency services and record the exposure, symptoms, and any medicines. Offer sips only to a fully alert person who swallows normally. Hospital clinicians may use IV Fluid Therapy and other monitoring when cooling and hydration need supervised care.

Confusion, unusual behavior, loss of consciousness, seizure, breathing problems, or ongoing vomiting require immediate emergency care. Do not assume a high Fever is the only measure that matters: heat stroke can be present when the reading is unavailable or misleading. Continue cooling while waiting, provided it does not interfere with safe breathing or transport.

Ask which exposure triggered the episode, whether a medicine or health condition contributed, how to plan breaks and hydration, and when strenuous activity can resume.