10/02/2026
Evidence reviewed by the International Agency for Research on Cancer indicates that regularly drinking beverages at very high temperatures may increase esophageal-cancer risk. The concern is heat injury to the lining of the esophagus rather than tea or coffee themselves. IARC has classified very hot beverages, generally above about 65°C (149°F), as probably carcinogenic to humans. Letting drinks cool before sipping is a simple precaution. This does not mean ordinary warm tea or coffee causes cancer, and overall risk is also influenced by smoking, alcohol use, diet and other factors.