No — there is no good evidence that coffee is bad for a sore throat. The temperature you drink it at is a real question; the coffee is not. Standard advice for a sore throat is simply to drink soothing liquids, and it explicitly allows both temperatures: “You can either drink warm liquids, such as lemon tea with honey, or cold liquids, such as ice water. You could also suck on a fruit-flavored ice pop” (MedlinePlus, Pharyngitis). A coffee that is comfortable to drink fits that description. A coffee hot enough to make you wince does not.
The one number worth having: 65 °C (149 °F). The International Agency for Research on Cancer classifies drinking very hot beverages as “probably carcinogenic to humans (Group 2A)” for oesophageal cancer, and defines the term precisely — “‘Very hot’ refers to any beverages consumed at a temperature above 65 °C.” The same evaluation reviewed more than 1,000 studies and found “no conclusive evidence for a carcinogenic effect of drinking coffee,” classifying coffee itself as Group 3, not classifiable (IARC press release N° 244, 15 June 2016). As IARC’s then-director put it: “it is the temperature, rather than the drinks themselves, that appears to be responsible.”
Be clear about what that does and does not say. It is a long-term cancer-risk finding about the oesophagus, not a claim about whether your throat will hurt more this afternoon. But it is the only sourced temperature threshold in this whole subject, and it happens to point the same way as common sense: let the cup cool before you drink it. Coffee is brewed far above that line — the recommended brewing range is 195–205 °F — so the cup that comes out of your brewer is, by IARC’s definition, “very hot” until it has cooled substantially. If you want that to happen faster, we have five ways to cool coffee down quickly.
Table of Contents
Four things this page used to claim that we could not stand up
“Sugar in your coffee feeds the bacteria.” The old version said adding sugar “can provide an excellent food source for bacteria, particularly if your sore throat is due to a bacterial infection.” Nothing supports that. Bacterial pharyngitis is treated with antibiotics after a positive test, and MedlinePlus is blunt about the diagnosis: “Your provider cannot diagnose strep throat by symptoms or a physical exam alone.” Sugar in a drink is not part of that picture, and the claim has been removed.
“Caffeine acts as a mild analgesic, potentially relieving some pain.” Cited to nothing. Caffeine does appear in some combination painkillers, but that is a formulated dose alongside another drug, not a cup of coffee treating a sore throat, and we found no evidence for the latter. MedlinePlus’s list of things that help is short and does not include coffee: soothing liquids, gargling with warm salt water, hard candies or throat lozenges (not for young children, “because they can choke on them”), a cool-mist vaporizer or humidifier, and over-the-counter acetaminophen or ibuprofen.
“Coffee dehydrates you and dries out your throat.” Overstated. A crossover trial in 50 habitual male coffee drinkers compared four 200 mL coffees a day against the same volume of water across total body water, blood and urine markers and concluded that “coffee, when consumed in moderation by caffeine habituated males provides similar hydrating qualities to water” (Killer, Blannin & Jeukendrup, PLoS ONE 2014;9(1):e84154). That study is 50 habituated men and no more, and the same paper notes caffeine does act as a diuretic at large doses of 500 mg or more. But a normal morning’s coffee is not drying your throat out, and the old FAQ’s flat “yes, coffee can dry out your throat” was not supportable.
“Extremely hot or cold beverages could exacerbate a sore throat.” The cold half is folklore, and the source above contradicts it directly by recommending ice water and ice pops. If cold drinks feel better to you, have cold drinks. Iced coffee is a perfectly reasonable option here, and it solves the temperature problem outright.
What about coffee’s acidity?
This is the claim we most expected to confirm and could not. We found no source measuring throat irritation from coffee’s own acidity, and we are not going to assert a mechanism on the strength of it sounding plausible. What we can say is where acidity genuinely does come into it: reflux. NIDDK lists among the symptoms of reflux disease “symptoms of complications in the mouth, throat, or lungs, such as chronic cough or hoarseness,” alongside regurgitation of stomach contents “into your throat or mouth” (NIDDK, GER & GERD).
Coffee’s part in that is real but smaller than usually claimed. Several studies have linked regular coffee to reduced pressure in the valve at the top of the stomach and to heartburn, but a 2022 review of the whole literature concludes that “most data are not in favor of a direct effect of coffee on gastro-esophageal reflux, which is rather a combined or additive effect to other risk factors such as obesity and a poor diet” (Nehlig, Nutrients 2022;14(2):399). So: if your sore throat is recurrent, comes with heartburn, and is worse in the morning, reflux is worth investigating and coffee is one of several things to look at. If your throat hurts because you have a cold, coffee’s acidity is not the issue.
When a sore throat needs a doctor
This is the part the old version of this page was missing entirely, and it matters more than anything above. From MedlinePlus:
- Seek medical care right away if you have a sore throat and trouble breathing.
- Contact your provider if you develop a sore throat that does not go away after several days.
- Contact your provider if you have a high fever, swollen lymph nodes in your neck, or a rash.
Two more points from the same page that change how you should think about the whole question. First, “most sore throats are caused by viruses. Antibiotics do not help viral sore throats” — so most of the time you are managing comfort, not fighting an infection, and comfort is exactly what a drink can and cannot do. Second, listed complications include ear infection, sinusitis and “abscess near the tonsils,” which is why a sore throat that is getting worse rather than better after several days is a reason to be seen rather than to keep gargling.
The practical answer
Have the coffee if you want it. Let it cool below the point where it is uncomfortable to swallow, or have it iced. Drink water alongside it because you are probably drinking less than usual while you feel rough, not because coffee is dehydrating you. Keep the salt-water gargle and the painkillers doing the actual work. And if the throat is still there after several days, or arrives with a high fever, a rash, swollen glands or any difficulty breathing, stop thinking about your coffee and get it looked at.
If coffee is leaving your stomach unsettled rather than your throat, that is a different mechanism — see why coffee makes you nauseous.
Disclaimer: This article is general information, not medical advice, and it cannot tell you what is causing your sore throat. Strep throat cannot be diagnosed from symptoms alone and needs a test. If you are unsure, unwell, immunosuppressed, pregnant, or caring for a child with a sore throat, ask a clinician rather than a website.
