Various other indicators of cancer. Because cancer that occurs in the respiratory tract can manifest in many different possible locations, many varied symptoms are possible. Pain may be sited in as seemingly unconnected places as the ears, or even the chest. This is called radiated pain, in which pain seems to move to an area well beyond the point of location of the cancer. Some sufferers will experience discomfort while ingesting certain kinds of food, especially foods that are spicy or acidic. Others will report traces of blood in their spittle. But one of the most indicative of all symptoms of cancer is weight-loss, as this accompanies virtually every kind of cancer.