Relationship Between Tea Drinking Behaviour and Rosacea: A Clinical Case-control Study

The exact mechanisms of rosacea development are unknown, but it has been suggested that tea consumption may be associated with its development. To determine the relationship between tea drinking behaviour and rosacea, this clinical case-control study recruited 2,063 participants, who completed a questionnaire about tea drinking behaviour. A 1:1 ratio propensity score matching method was used to generate 619 cases and 619 controls. High-frequency tea drinking (3 times/day: adjusted odds ratio (aOR) 2.592; 95% confidence interval (95% CI) 1.225–5.485; ≥ 4 times/day; aOR 8.86; 95% CI 3.43–22.887), non-fermented tea (aOR 2.172; 95% CI 1.562–3.022), and hot tea (aOR 2.793; 95% CI 1.796–1.344) were associated with an increased risk of rosacea. Further results showed that these tea drinking behaviours were significantly associated with an increased risk of flushing (aOR 1.41; 95% CI 1.07–1.87) and erythema (aOR 1.48; 95% CI 1.10–2.00). Tea drinking behaviour is closely related to rosacea and mainly affect flushing and erythema.