Lung cancer is the third most common cancer type and the main cause of cancer-related deaths in the United States. According to the American Cancer Society (ACS), it is most common in males, and in the U.S., Black males are around 12% more likely to develop it than white males.Smoking is a major risk factor, although not everyone who develops lung cancer has a history of smoking. Lung cancer can be fatal, but effective diagnoses and treatments are improving the outlook. This article will explain what lung cancer is, how to recognize the symptoms, and what treatment options are available 肺癌第四期平均壽命.