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The evidence

Does coffee cause rosacea?

Almost every rosacea forum will tell you to give up coffee. The published research points the other way. The short version: caffeine is associated with lower rosacea risk, and the thing that triggers a flare is the heat of the drink, not the coffee in it. Here is what the studies actually found. This is informational, not medical advice.

lower
Higher caffeine intake was associated with lower rosacea risk in a study of 82,737 women (Li et al., JAMA Dermatology 2018).
60°C
Hot water and hot coffee at the same temperature produced a similar flushing response; the cold versions did not. The heat is the variable.
36%
Of patients report heated beverages (any hot drink) as a trigger, in National Rosacea Society survey data (n=1,066).

Where the "coffee is bad" idea came from

The National Rosacea Society's patient trigger survey asked about triggers in plain-language buckets, and one of them was "heated beverages." It pooled coffee, tea, and hot water together under the temperature category, and about 36% of patients named it. In the years since, that bucket got re-told in patient summaries and forum threads as "coffee" and "caffeine," because those are the heated beverages most people drink, and because the chemistry felt like it ought to matter.

It does not, at least not in the direction everyone assumed. When researchers looked at caffeine directly, the association ran the opposite way.

What the caffeine study found

Li and colleagues followed 82,737 women in the Nurses' Health Study II and analyzed caffeine intake against the risk of developing rosacea (Li S, Chen ML, Drucker AM, et al. JAMA Dermatology 2018;154(12):1394-1400). The headline finding was that increased caffeine intake was inversely associated with rosacea risk, with the lowest risk among those drinking the most caffeinated coffee. The effect tracked caffeine from coffee specifically; decaffeinated coffee did not show the same association. Whatever coffee is doing here, it is not causing rosacea.

The one thing the evidence rules out is the thing everyone is told: that the coffee is the problem.

So what is the trigger? The temperature.

A hot drink can still set off a flare, and the reason is heat. The rosacea-prone face has an exaggerated thermoregulatory response: heat-sensing channels including TRPV1 respond by widening blood vessels, which is flushing. Controlled work on the question has shown that hot water and hot coffee at the same temperature produce a similar flushing response, while the cold versions of each do not. The variable that matters is the temperature, not the beverage.

That is why "hot drinks" sit on trigger lists rather than "coffee," and it is a more useful thing to track. If you log "coffee" as your trigger, you may give up something that is not hurting you and keep drinking hot tea that is. If you log "hot drink," you are watching the variable the evidence actually implicates.

Test it on your own face, not on forum lore.

The cleanest experiment is simple: try your coffee iced for a couple of weeks and watch what happens, with a daily photo so you are reading your skin, not your memory. Skinframe makes that easy and turns it into a record for your dermatologist. Your photos stay in your own iCloud. One-time $29.99, or $4.99 a month with one-tap cancel.

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Questions

Does coffee cause rosacea?

Coffee itself does not appear to cause rosacea. In a study of 82,737 women (Li et al., JAMA Dermatology 2018), higher caffeine intake from coffee was associated with a lower risk of developing rosacea, not a higher one. What can trigger a flare is the heat of a hot drink: heated beverages are a reported trigger for about 36% of patients in National Rosacea Society survey data. The practical takeaway is that the temperature, not the coffee, is the thing to watch.

Should I stop drinking coffee if I have rosacea?

Not necessarily, and the evidence does not support giving it up on principle. If hot drinks flare you, the simplest experiment is to try the same coffee iced or cooled and see whether the flushing changes, since the heat is the likely trigger rather than the caffeine. Track it for a couple of weeks before concluding, and discuss any management plan with your dermatologist.

Is it the caffeine or the heat that triggers rosacea?

The evidence points at the heat. Caffeine intake has been inversely associated with rosacea risk, and controlled work has shown that hot water and hot coffee at the same temperature produce a similar flushing response, while the cold versions do not. The face's heat-sensing pathways (including TRPV1) drive thermoregulatory flushing, which is why hot drinks of any kind, not coffee specifically, sit on most trigger lists.

Read next: the full analysis in it's the temperature, not the caffeine, the data on what triggers rosacea, or how to find your own triggers.

Sources: Li S, Chen ML, Drucker AM, et al. Association of Caffeine Intake and Caffeinated Coffee Consumption With Risk of Incident Rosacea. JAMA Dermatology 2018;154(12):1394-1400. National Rosacea Society patient trigger survey (n=1,066), rosacea.org. This page is informational and not medical advice.