Pain below the clavicle in the chest is commonly caused by costochondritis and is more frequent in female patients. The symptoms may worsen after activity, such as localized soreness and swelling, and oral pain medication may be taken during episodes. In addition, some patients are considered to have thoracic disease, which commonly occurs as an occupying lesion in the lung tissue, and the development of tumor may involve the mural pleura, and the patient will not only have chest pain, but also have significant cough and sputum, or even cough with blood. If the tumor is combined with obstructive pneumonia, the patient will also have chest tightness and shortness of breath, which will worsen after activity and fever. If necessary, conservative treatment can also be carried out, including anti-infection, cough expectorant and other symptomatic treatment. The cause of chest tumor is considered to be related to smoking.