Feeling Dizzy in Hot Weather? What to Track and When to Call
A reader wrote in with a common summer concern: feeling dizzy when the weather gets hot. They want to know if there are ways to prevent it and what other symptoms they should track to help understand the cause.
According to the Cleveland Clinic, dizziness can be one sign of heat exhaustion, along with heavy sweating, headache, nausea, thirst, weakness, muscle cramps, a fast heart rate, and cold or clammy skin.
Heat exhaustion happens when the body struggles to cool itself down, especially after spending time in hot weather or overexerting during physical activity.
It doesn’t stop at heat exhaustion. The Conversation found that heat-related illness can also include heat stroke. It states that someone with heat exhaustion may feel weak, nauseous, headachy, or dizzy. Heat stroke is more dangerous and can bring confusion, agitation, convulsions, or even coma.
If someone is experiencing heat stroke, it’s an emergency and needs medical attention.
Why heat can make you dizzy
To explain this, let’s consider a specific scenario: you go outside, mow the lawn, walk the dog, and then go pick up groceries. It’s a very hot day and you naturally sweat. You lose fluids and because of this your body tries to send more blood toward the skin to release heat. If you don’t replace enough water and electrolytes, dizziness can occur.
AFC Urgent Care states that dehydration is one of the most common reasons people feel dizzy in hot weather. It can lower blood volume, reduce circulation, and make dizziness worse when standing. The same source also points to low blood pressure and electrolyte imbalance as possible heat-related causes.
For some people, the issue may feel more like vertigo. FYZICAL adds that heat, humidity, dehydration, and electrolyte changes can worsen balance problems, especially for people who already deal with inner ear conditions such as BPPV or Meniere’s disease.
What to track if experiencing dizziness in hot weather
- When the dizziness happens
- How hot it was
- How long you were outside
- What you were doing
- How much water you drank that day
- Whether you were sweating heavily
- Any nausea, headache, cramps, weakness, or fast heartbeat
- Whether the dizziness happened when standing up
- Any new medication or dose change
- Whether symptoms improved after cooling down
According to NIH, older adults face higher risk in hot weather because age, chronic conditions, some medications, poor circulation, reduced sweating, alcohol use, and dehydration can all make heat-related illness more likely.
What experts recommend
The Cleveland Clinic says someone with signs of heat exhaustion should move to a cooler or shaded area, loosen extra clothing, lie down with legs raised, cool the body with towels or fans, and slowly sip fluids if heat stroke is not suspected.
As The Conversation explains, getting out of the heat, staying hydrated, loosening clothing, using cool water, taking a cool shower, or applying ice packs to the neck, groin, and armpits can help bring body temperature down.
When to call a doctor
Any new health change is worth discussing with a doctor, especially if you’re over 50, take blood pressure medicine, have heart disease, diabetes, kidney problems, or the dizziness keeps coming back.
Call a doctor if dizziness happens more than once, comes with weakness, nausea, headache, swelling, faintness, or doesn’t improve after cooling down and drinking fluids.
Call 911 right away if there’s confusion, slurred speech, behavior changes, fainting, hot dry skin, a very high body temperature, or symptoms that feel severe.
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