POTS and Heat: Why Summer Hits So Much Harder

☀️ Why summer feels like a different disease entirely

Winter is manageable. Then summer arrives, and suddenly you can't get through a grocery run without your heart pounding, your vision swimming, or a wave of nausea hitting out of nowhere. If POTS turns genuinely harder to manage the moment the temperature climbs, this isn't weakness or being "dramatic about the heat" — it's one of the most consistently reported and physiologically explainable patterns in the condition.

🌡️ Why heat specifically makes everything worse

Heat causes blood vessels near the skin to dilate as part of your body's normal cooling response — more blood gets routed to the surface to release warmth. In a body that's already struggling to keep enough blood circulating to the brain when upright, this extra vasodilation is working directly against you, on top of the low blood volume already central to POTS. Sweating adds a second layer, gradually depleting fluid and sodium — exactly the two things your management plan likely depends on most.

💧 Sweating, but differently than most people

Some people with POTS and related dysautonomia also experience irregular sweating patterns — sweating too much in some areas, too little in others (a pattern sometimes called anhidrosis or hyperhidrosis depending on direction). This isn't universal, but if your body doesn't cool itself evenly, heat intolerance can be even more pronounced than blood volume alone would explain.

🧊 Practical cooling strategies that actually help

• Cooling vests or neck wraps — evaporative or gel-based cooling products are widely used in the POTS community specifically because they cool the body without requiring you to drink more than you already are.

• Timing activity for cooler hours — early morning or evening errands, rather than midday heat, when it's feasible to plan around.

• Increasing fluid and electrolytes proactively on hot days, following whatever plan you've discussed with your doctor, rather than waiting until you feel unwell to catch up.

• Cool showers or a damp cloth on the neck/wrists before heading out, to lower your starting core temperature.

• Avoiding hot showers, baths, and saunas generally, since they trigger the same vasodilation as ambient heat, sometimes more intensely.

🚗 The hidden heat trap: cars

A car that's been sitting in the sun can reach dangerous internal temperatures within minutes, and going straight from an air-conditioned building into a hot car is one of the more commonly reported symptom triggers in the POTS community. Running the AC before getting in, or parking in shade when possible, are small habits that meaningfully reduce this specific exposure.

❓ Frequently asked questions

📚 Sources & further reading

The information in this article is drawn from the following sources. We encourage you to explore them, and to always discuss heat management strategies with your doctor given your specific situation.

• Dysautonomia International — What is POTS?

• PoTS UK — Managing PoTS