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Overview
Heat can briefly worsen MS symptoms.
Overactive thyroid causes heat intolerance.
When to get medical care
Call 911Sudden weakness or trouble speaking.
Get care todaySymptoms that don't improve when cool.
See a doctor soonNew heat sensitivity.
Causes
Causes include MS and overactive thyroid.
OwieClear has pages on 0 conditions that can cause symptoms worse in heat or hot showers. Each shows how soon to get care.
What you can do at home
- Stay cool.
Medicines
Depends on cause.
At the doctor
Tests depend on symptoms.
Questions you may be asked
- Symptoms
The exam
A nerve exam.
Tests
- MRI
- Thyroid tests
Prevention
Stay cool.
- Avoid overheating
Check your symptoms
Most symptoms have more than one possible cause. The symptom checker looks at all of your symptoms together, plus your age, and shows how soon to get care.
Sources
Last updated 2026-11-13.