Sauna and Thermal Bathing: What the Research Says (and Where to Try It)

Saunas have gone from Finnish tradition to wellness trend in a few short years. Bathhouses are opening across the UK, and "contrast therapy" is everywhere.

So is heat genuinely good for you, or is it just a very pleasant way to spend an afternoon? Here's what the evidence says.

The study that started the buzz

It's an impressive finding, but it needs context:

• It's observational. It shows a link, not proof that sauna caused the difference. Frequent sauna users may be healthier in other ways too.
• It studied Finnish men, in a culture where sauna is part of daily life.
• Traditional Finnish sauna was studied, not infrared cabins or steam rooms, which work differently.

So: promising, but not a guarantee.

What heat does in the moment

When you sit in a sauna, your heart rate rises, blood vessels widen and you sweat, a bit like gentle exercise. Afterwards, many people feel deeply relaxed and sleep well. That sense of calm is real, even if the long-term science is still developing.

What about the cold plunge?

Cold water is often paired with sauna. It can feel invigorating and many people love it, but the evidence for long-term health benefits is more limited than social media suggests. The biggest effect for most people is simply feeling alert and good afterwards, which is fine.

If you try it, go gently. Cold water causes a sudden gasp reflex, so never plunge alone into open water, and build up slowly.

How to do it safely

• Start short: 5–10 minutes is plenty at first.
• Hydrate before and after.
• Skip alcohol before or during.
• Get out if you feel dizzy or unwell.
• Check with your GP first if you're pregnant, have a heart condition or have blood pressure concerns.

Where to try it

UK

• [Eynsham Baths at Estelle Manor](https://estellemanor.com/eynsham-baths/), Oxfordshire. Roman-inspired thermal bathing rituals.
• [Thermae Bath Spa](https://www.thermaebathspa.com/), Bath. Britain's natural thermal springs.

Europe

• [Löyly](https://www.loylyhelsinki.fi/), Helsinki. An architectural seafront sauna where you can swim in the Baltic between rounds. Finnish sauna culture at its best.
• [Arctic Bath](https://arcticbath.se/), Swedish Lapland. Saunas and cold plunges on a floating spa.
• [The Retreat at Blue Lagoon](https://www.bluelagoon.com/), Iceland. Geothermal bathing in the lava fields.
• [Terme di Saturnia](https://www.termedisaturnia.it/), Tuscany. Naturally warm sulphur springs in the countryside.
• [Grand Resort Bad Ragaz](https://www.resortragaz.ch/), Switzerland. Thermal springs alongside a prevention-focused medical centre.

The NOUI take

Regular sauna use is one of the more promising, and more enjoyable, habits in longevity research. But the evidence isn't settled, so treat it as a lovely addition to the basics of sleep, movement and connection, not a replacement for them.

Find more in Wellness Escapes, or read how to choose a wellness escape.

This article is for general information and isn't medical advice. Speak to your GP before using saunas or cold water if you have a health condition or are pregnant.