Regular Sauna Bathing and the Incidence of Common Colds

Ernst et al., Annals of Medicine, doi:10.3109/07853899009148930, Jan 1990
Case 28% improvement lower risk ← → higher risk Thermotherapy  Ernst et al.  PROPHYLAXIS Does thermotherapy reduce common cold infections? Prospective study of 50 patients in Austria Fewer cases with thermotherapy (not stat. sig., p=0.05) c19early.org Ernst et al., Annals of Medicine, January 1990 0 0.5 1 1.5 2+ RR
53rd treatment shown to reduce risk in December 2023, now with p = 0.026 from 4 studies.
Lower risk for recovery.
No treatment is 100% effective. Protocols combine treatments.
6,300+ studies for 210+ treatments. c19early.org
Prospective study of regular sauna bathing, showing fewer common colds with treatment. Fifty volunteers were split into a treatment group that took weekly sauna baths and a control group that abstained. Over six months, the sauna group had significantly fewer common colds (33 vs 46) and fewer days with cold symptoms (221 vs 343) compared to controls. The difference was particularly pronounced in the last three months, when the sauna group had less than half as many colds. There were no significant differences between groups in duration or severity of colds.
risk of case, 28.3% lower, RR 0.72, p = 0.05, treatment 25, control 25.
Effect extraction follows pre-specified rules prioritizing more serious outcomes. Submit updates
Ernst et al., 31 Jan 1990, prospective, Austria, peer-reviewed, 4 authors.
$0 $500 $1,000+ Efficacy vs. cost for COVID-19 treatment protocols c19early.org December 2025 Austria United Kingdom Russia USA Sudan Angola Colombia Kenya Mozambique Vietnam Peru Philippines China Uzbekistan Nepal Ethiopia Iran Ghana Mexico South Korea Germany Bangladesh Saudi Arabia Algeria Morocco Yemen Poland India DR Congo Madagascar Thailand Uganda Venezuela Nigeria Egypt Bolivia Taiwan Zambia Fiji Bosnia-Herzegovina Ukraine Côte d'Ivoire Bulgaria Greece Slovakia Singapore Iceland New Zealand Czechia Mongolia Israel Trinidad and Tobago Hong Kong North Macedonia Belarus Qatar Panama Serbia CAR Austria favored high-profit treatments.The average efficacy of treatments was very low.High-cost protocols reduce early treatment, andforgo complementary/synergistic benefits. More effective More expensive 75% 50% 25% ≤0%
$0 $500 $1,000+ Efficacy vs. cost for COVID-19treatment protocols worldwide c19early.org December 2025 Austria United Kingdom Russia USA Sudan Angola Colombia Kenya Mozambique Vietnam Peru Philippines China Uzbekistan Nepal Ethiopia Iran Ghana Mexico South Korea Germany Bangladesh Saudi Arabia Algeria Morocco Yemen Poland India DR Congo Madagascar Thailand Uganda Venezuela Nigeria Egypt Bolivia Zambia Fiji Bosnia-Herzegovina Ukraine Côte d'Ivoire Eritrea Bulgaria Greece Slovakia Singapore New Zealand Malawi Czechia Mongolia Israel Trinidad and Tobago North Macedonia Belarus Qatar Panama Serbia Syria Austria favored high-profit treatments.The average efficacy was very low.High-cost protocols reduce early treatment,and forgo complementary/synergistic benefits. More effective More expensive 75% 50% 25% ≤0%
Regular Sauna Bathing and the Common Colds
E Ernst', P. Wirz2 E Pecho2
Incidence of Saradet h2 The high morbidity of common colds means that their economic importance is considerable, with colds causing more loss of productivity than any other infection. As no effective prophylaxis is available, this trial was to test the hypothesis that sauna bathing can reduce the incidence of common colds. Twentyfive volunteers were submitted to sauna bathing, with 25 controls abstaining from this or comparable procedures. In both groups the frequency, duration and severity of common colds were recorded for six months. There were significantly fewer episodes of common cold in the sauna group. This was found particularly during the last three months of the study period when the incidence was roughly halved compared to controls. The mean duration and average severity of common colds did not differ significantly between the groups. It is concluded that regular sauna bathing probably reduces the incidence of common colds, but further studies are needed to prove this.
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