It’s also great for certain mental health issues: spending time naked with a mixed crowd (yes mixed female and male) can be eye opening.

Saunas are a great leveller between humans all living the same experience yet feeling alone in doing so.

Also anecdotal evidence, I haven't been sick this whole past 12 months. Any change I made in the past 12 I could've contributed to this. Nothing particular comes to mind but there were lots of changes (e.g. work, home, diet). That's the issue.

You'd have to stop sauna for a while and see if it reverses to strengthen the anecdotal case I guess.

I heard that we often get cold/flu/sore throat when we get too cold outside, because the inside of our orifices is kept at a certain temperature to kill those bacteria/viruses. When we get too cold, we are unable to kill them fast enough, and get overrun. Staying in 70-100°C air for prolonged time must also heatshock those parts of our bodies, so I guess we kinda sterilize it that way.

At least my 2c why I think its helping

+1