A lung mass is a foreign body in the lungs, usually a problem with a lung tumor, which is mainly manifested by coughing, chest tightness, shortness of breath, and chest pain. Most of this can be checked out by CT, the next step is to check the size of the tumor and whether it is benign. If it is a benign tumor, it is enough to arrange surgery to remove it as early as possible. If it is a malignant tumor, the cancer cells have the possibility of spreading and metastasis, which is fatal to human body. Generally speaking, most lung tumors are benign tumors, which require careful care and nursing after healing. Quit smoking, stop drinking, do not eat spicy and stimulating foods and have a regular work and rest schedule, which can effectively avoid the invasion of cancer.