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A study of a population in Northern Iran gives a conclusion that the hot tea has associated with a high risk of esophageal cancer . It reported for the first time on 27 March 2009 in the British Medical Journal (BMJ).

Farhad Islami, MD, from the Shariati Hospital, Tehran University of Medical Sciences in Iran, and colleagues writen that the relation between drunk hot drink and esophageal cancer risk has been reported in several studies from various parts of the world. "In Golestan, tea and water consumed by common people, compared with the average intake. An ecological research shows that the population of Golestan drink tea at a higher temperature than the people who live in neighbour areas with lower incidences of esophageal cancer" they reported.

The objective of this research is to evaluate relation between drinking tea habits in the province of Golestan in Northern Iran, which is a region with high incidence of squamosh cancer cells (SCC), and the risk of suffering the disease. Dringking tea habit and the temperature at which tea is usually drunk also determined for healthy people who are registered in the research. The researches were reporting that drinking hot tea, a common habits in the province of Golestan, is associated with a high risk of esophageal cancer.

Also the researches write that a large proportion of Golestans that drunk hot tea, then this habit can be counted as an important part of the esophageal cancer cases in this population. Informing the public about the dangers of drinking hot tea can help in reducing the incidences of the cancer in the Golestan and in a population that has a similar high risk due to teh same habit.

David C. Whiteman, from the Queensland Institute of Medical Research at the Royal Brisbane Hospital in Australia, recommended to tea to cool down the tea for 5 - 10 minutes before drinking. He added that mechanism of heat need to encourage the development of tumor explored further and may provide a better feedback about the basics of this discovery. This is not a warning, however, and this should not reduce the enthusiasm of people to respect the dringking tea ceremony. Instead, we must follow the recommendations resulting from this research is to take time 5 to 10 minutes between making and pouring tea, which will be enough provide a sense of good and not cause injury due to heat.