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Heat Intolerance

Written by Natalie Rivans CSP, CMMT

Published on Apr 04, 2026

Updated on Apr 04, 2026

Updated on Apr 04, 2026

Table of Contents

What is Heat Intolerance?

Heat intolerance means an abnormal sensitivity to warm environments — feeling overheated, faint, or dramatically worsened by temperatures that others tolerate comfortably. It can lead to avoidance of outdoors, exercise, hot showers, or crowded spaces. It is different from simply disliking heat; it is a physical inability to regulate body temperature effectively.

How to know if Heat Intolerance is chronic

  • Symptoms triggered by mild warmth that others tolerate
  • Occurring consistently for months
  • Accompanied by dizziness, nausea, fatigue, or heart palpitations in the heat
  • Significantly restricting activities, especially in summer

Heat Intolerance can be associated with the following conditions:

How brain training & re-origin can help

Heat intolerance in autonomic conditions reflects the nervous system’s reduced ability to regulate vascular responses to temperature. Re-origin’s approach to nervous system rehabilitation helps restore autonomic flexibility, which for many members leads to gradual improvements in heat tolerance as their overall regulation improves.

FAQs

Why does heat make my symptoms worse?

Heat causes blood vessels to dilate and redirects blood to the skin for cooling. In conditions like POTS, this exacerbates blood pooling and reduces blood pressure, worsening symptoms.

Can heat intolerance be a sign of POTS?

Yes. Heat is one of the most common triggers for POTS symptom worsening. Take the POTS self-assessment at re-origin.com/pots-syndrome-quiz.

What can I do to manage heat intolerance?

Cooling strategies (cooling vests, cold drinks, air conditioning), avoiding peak heat hours, and increasing salt and fluid intake are commonly recommended. Improving autonomic regulation through brain retraining can address the underlying cause.

Does heat intolerance improve with treatment?

For many people, yes. As autonomic regulation improves, tolerance to heat often improves alongside it.

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