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What to do if…
you develop severe muscle cramps and feel overheated in hot weather

Produced and maintained by PanicStation.org Published: Last reviewed: Editorial policy UK guide

Short answer

Stop what you are doing, move to a cooler place, and start cooling your body now. Call 999 or 112 now if you are still unwell after 30 minutes of cooling, or sooner if you develop heatstroke signs such as confusion, collapse, a seizure, loss of consciousness, or rapidly worsening symptoms.

Do not do these things

  • Do not push through the cramps or keep exercising, walking, or working in the heat.
  • Do not go back into the heat to finish the task.
  • Do not gulp a very large amount of water quickly; take steady sips if you can swallow safely.
  • Do not force drinks into someone who is very drowsy, choking, confused, or repeatedly vomiting.
  • Do not drink alcohol to rehydrate.
  • Do not leave someone alone if they seem very unwell, faint, confused, or not themselves.
  • Do not drive yourself to A&E if you may have heatstroke.

What to do now

  1. Stop and move somewhere cooler immediately. Go indoors if you can. If that is not possible, get into deep shade and away from hot surfaces such as pavements, vehicles, or walls holding heat.
  2. Remove heat-trapping clothing. Take off unnecessary layers such as a jacket, socks, hat, protective outerwear, or tight equipment if it is safe to do so.
  3. Cool the skin straight away. Spray or sponge the skin with cool water and fan the skin. Put cold packs wrapped in cloth on the neck and under the armpits if you have them.
  4. Sip fluids only if you can swallow safely. Take frequent small sips of cool water. If you have been sweating heavily, a sports drink or oral rehydration drink may help replace fluid, salts, and sugar.
  5. Ease the cramps without forcing the muscle. Rest the affected muscle. Gently stretch or lightly massage the cramping area if it helps, but stop if the pain becomes sharp, severe, or worse.
  6. Check for heatstroke signs. Call 999 or 112 now if any of these are present:
    • still unwell after 30 minutes of resting somewhere cool, cooling the skin, and drinking fluids if safe
    • confusion, poor coordination, unusual behaviour, or not making sense
    • collapse, loss of consciousness, or a seizure
    • very hot skin, especially if sweating has stopped
    • fast breathing, shortness of breath, or a very fast heartbeat
    • symptoms that are rapidly worsening
  7. If it is not a 999 emergency but you are struggling to treat the symptoms, get urgent medical advice. Contact 111 where available, or use your local urgent care route.
  8. If you are with someone else, stay with them. Keep cooling them, keep them resting, and do not let them return to the heat to finish what they were doing.

What can wait

  • You do not need to work out the exact cause right now.
  • You do not need to finish the activity, get home quickly, or prove you are okay.
  • You do not need to decide future exercise, work, travel, or plans while you are still hot and cramping.
  • Messages, explanations, and non-urgent arrangements can wait until you are cooler and safer.

Important reassurance

Severe cramps and feeling overheated in hot weather can come on suddenly, including in fit and healthy people. Stopping early and cooling down is a sensible safety step, not an overreaction.

Scope note

These are first steps for the immediate situation only. Ongoing symptoms, repeated episodes, chest pain, severe weakness, repeated vomiting, or worries about medicines or a health condition may need specialist medical assessment.

Important note

This guide is general information and is not medical advice, a diagnosis, or a substitute for urgent professional help. If you think you or someone else may have heatstroke, or symptoms are severe or worsening, call 999 or 112.

Additional Resources

Closely connected guides that may be useful during the same situation or its immediate aftermath.

About this guide

This guide was produced and is maintained by PanicStation.org using its published editorial process. Official and specialist sources are checked where relevant, and AI-assisted tools may be used for drafting, organisation, and consistency checks. The site operator remains responsible for publication, revision, and removal decisions.

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