Lung cancer is the leading cause of cancer death worldwide. This is largely because it is initially asymptomatic and is usually discovered in later stages. Lung cancer diagnosis using computed tomography has recently been shown to have great benefits, and implementation of this practice is growing. Once lung cancer is suspected, it must be diagnosed and staged, and there are recent guidelines to assist in this process. Treatment is determined by the type of lung cancer and the stage of the lung cancer, and there are a number of personalized therapies that didn’t exist just a few years ago.