Once in a while, but very infrequently, I’m asked the question: “Johannes, I’ve got diarrhoea after infrared sauna use! How is this possible?!” This blog post explores the science of several different potential answers to the diarrhoea after sauna link.
I hope you’re not eating or drinking right now because we’ll be covering a topic that affects people on a visceral level:
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What Is “Diarrhoea”, “Dysentery”, Or “The Runs”
With the “runs” everyone knows what I mean but tackle the issue from a more scientific definition:
If you have diarrhoea or “the runs”, your stools have become very loose and are paired with tons of water. That problem originates because either your bowels don’t absorb much water anymore or they expel too much of it. Diarrhoea is a sign that your bowel movements have been impaired and that food isn’t properly digested.
Diarrhoea can have many different causes, types, and solutions – so there’s no one monolithic phenomenon called “diarrhoea” (1; 2; 3). And while the condition seems harmless to many people in the developed world, diarrhoea still causes 200,000 deaths every year on a worldwide basis.
Why?
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Let me explain:
Acute diarrhoea isn’t dangerous in most cases. In the long-term, however, diarrhoea can cause a mineral loss in the human body and even eventually the dreaded death. In this blog post, I’ll be talking about the occasional acute diarrhoea that people may have after an infrared sauna session.
Food intolerances, viruses and bacteria, poor hygienic conditions, improper gut microbiome makeup, and parasites are some of the main causes of acute diarrhoea. So how then can an infrared sauna give you diarrhoea? Several mechanisms exist, in fact – let’s explore four of them:
Reason 1: High Levels Of Stress Hormones
Several studies have actually explored the effects of saunas on your hormone levels.
For instance, the “cortisol” hormone that’s responsible for increasing the body’s breakdown of tissues doesn’t seem to increase with sauna use – although studies are contradictory (4; 5; 6). Adrenaline and noradrenaline, however, which are both stress hormones, can more than double though and stay elevated after a session (7; 8; 9).
And, even though I cannot find any research directly linking these neurotransmitters to diarrhoea, stress, in general, does increase diarrhoea risk (10; 11; 12; 13).
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So here’s why that dynamic matters:
Drugs that directly increase stress hormones such as adrenaline (epinephrine) also have acute diarrhoea as a common side-effect (14; 15).
My point?
If you’re not used to sauna sessions then they can be very stressful to the body, especially if you stay in too long. A similar concept would be when you’re starting to exercise after years of doing nothing – your body is simply not used to the stimulus and might feel very stressed initially.
Hence, your sessions might be so intense because you’ve not gotten used to the stimulus that your body pumps out tons of stress hormones. These stress hormones can cause diarrhoea, in turn.
Acute diarrhoea is harmless here, but, inconvenient, of course.
But, stress is not the only reason. Let’s consider another reason as to why can infrared saunas give you diarrhoea, potentially:
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