This is the part the category tends to bury, so here it is on its own page.
Sauna and cold immersion are not gentle. Both put load on the cardiovascular system, and that load is the reason a number of people should have a conversation with their doctor before using either. None of what follows is medical advice, and none of it replaces asking your own physician.
Heat raises heart rate and changes blood pressure. Cold immersion does its own work on circulation and can provoke a sharp response on entry. If you have any diagnosed heart condition or a blood-pressure condition, ask your doctor before using either, and ask specifically about doing both in one visit.
Anyone pregnant should talk to their obstetrician or midwife before using a sauna or a cold plunge, and should follow that guidance rather than a facility's general policy.
Some medications affect heart rate, blood pressure, circulation, the ability to sweat or sensitivity to light. Diabetes, neuropathy, circulatory conditions, a history of blood clots, seizure disorders and recent surgery are all reasons to ask first. Alcohol and heat should never be combined.
Never cold plunge alone. Get out of the heat or the cold when you have had enough rather than when a number says so. Stand up slowly. Stop entirely for dizziness, nausea, chest discomfort or breathing you cannot settle. And if you are trying to treat a symptom or an injury, see a physician instead.
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