Pain in the chest below the clavicle is commonly caused by costochondritis, and is more common in female patients. Symptoms may worsen with activity, such as localized soreness, and pain medication may be given orally during an attack. In addition, some patients are considered to be thoracic diseases, which commonly occurs in the lung tissue of the occupying lesion, the development of the tumor will involve the wall pleura, the patient not only has chest pain, but also accompanied by obvious cough, sputum, or even cough sputum with blood, CT examination can confirm the diagnosis. If the tumor is combined with obstructive pneumonia, the patient will have chest tightness, shortness of breath, aggravated by activity, and fever, and surgery can be chosen if the condition permits. 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.