Some like it hot. A study of over 50, 000 people who drank about 3 cups of hot tea a day at temperatures 140 degrees or greater showed a 90% greater chance of having esophageal cancers. This study was focused on tea drinkers, and further studies have not been done on coffee, but it might be a reason to let that coffee, or any other hot drink, cool down a bit before you consume it. It is noted in other medical research that drinking hot tea on its own does not cause the cancer, but if you have other risk factors, such as smoking or drinking alcohol, they raise your chances for esophageal cancer. Here is an article that tells you the symptoms of esophageal cancer, how it is diagnosed, and how it is treated. More details can be found here, including a link to the study of those 50,000 tea drinkers, and a link to the other medical research of those risk factors with hot tea consumption: