The short explanation
In hot weather, sweating and not drinking enough can cause dehydration, which lowers blood pressure and makes you feel weak and dizzy. Drinking fluids, including oral rehydration solution, resting in a cool place and avoiding the hottest hours often helps mild symptoms. See a doctor if you feel faint, the weakness does not improve with fluids and rest, or you have other symptoms. If you take blood pressure medicines or water tablets, heat can make them lower your pressure more, and your doctor may need to review them.
What depends on your situation
The parts of this that change from woman to woman. Uncertainty is stated, not hidden.
- Older women, people with diabetes or heart or kidney conditions, and those working outdoors or in hot kitchens are at higher risk.
- Signs of heat exhaustion include heavy sweating, headache, nausea, cramps and dizziness. Heatstroke is more serious, with confusion, very high temperature or hot dry skin.
- Wearing light loose clothing and carrying water helps prevent heat-related problems.
What this answer cannot determine
The boundary of online education. These need a clinician who can see you.
- This answer cannot check your blood pressure or decide on treatment. A doctor can examine you and review your medicines.
Questions for your clinician
Take these with you. You can add any of them to an appointment card.
- Do my medicines need adjusting in hot weather?
- How can I tell heat exhaustion from heatstroke?
- Should my blood salts be checked?
- What should I do if I feel faint in the heat?
When to seek help
Clinician-approved guidance for this topic. When in doubt, being seen is never the wrong choice.
Emergency — call 112 now
- Call 112 if someone in the heat becomes confused, faints and does not wake quickly, has a very high temperature or stops sweating.
Get help the same day
- Get same-day care if dizziness and weakness do not improve after rest and fluids, or if you cannot keep fluids down.
Book an appointment soon
- See a doctor within days to review blood pressure medicines if you often feel dizzy in the heat.
Sources
The evidence this explanation is built on.
- Heat exhaustion and heatstroke NHS
- High blood pressure MedlinePlus (US National Library of Medicine)
- High blood pressure (hypertension) NHS
Who wrote and reviewed this
Every AskHer answer names its author. A clinically reviewed answer also names the clinician who signed it off — if no clinician is named below, it has not been clinically reviewed.
- Author
- AskHer Editorial (AI-assisted draft) AskHer's editorial team — not an individual clinician Works in English, தமிழ், हिन्दी
- Clinical reviewer
- Nobody yet No clinician has signed this answer off, and no person on the editorial team has read it yet. That is what the “Written with AI assistance” label means. It is queued for an editor to read, and then for a clinician who works in this area. The sources it was drafted against are listed above.
- Review status
- Written with AI assistance — not yet reviewed by a person
- Last reviewed
- Not yet reviewed by a person
- Version
- 1
Correction history
Substantive changes are listed, not quietly edited away.
No corrections have been made since this answer was first published.
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