Irregular soft tissue density foci of lungs is the result of chest X-ray examination, which may be caused by lobar pneumonia, bronchopulmonary cancer, lung misshapen tumor and other diseases. 1. Lobar pneumonia: it may be caused by Streptococcus pneumoniae infection in the lungs, irregular soft tissue density foci of the lungs are found in chest X-ray, and high fever, dyspnea, rust-colored sputum and other phenomena may occur, which can be treated with drugs such as levofloxacin and moxifloxacin according to the doctor’s instruction. 2. Bronchopulmonary cancer: irritating choking cough, coughing up sputum, chest pain, chest tightness, respiratory effort and other symptoms, chest X-ray shows irregular soft tissue density foci of lungs, the effect of medication is not big, and it can be treated by lung resection according to the condition. 3. Lung malformation: it is a tumor-like malformation composed of abnormal combination of normal lung tissues due to abnormal development of normal lung tissues. Generally asymptomatic, mostly found during physical examination, some manifested as cough, sputum, hemoptysis, shortness of breath and other symptoms, chest X-ray examination manifested as irregular soft tissue density foci in the lungs, and early surgical treatment is generally recommended. When chest X-ray examination found lung irregular soft tissue density foci of patients, should go to the hospital as soon as possible to clarify the cause of the disease, after diagnosis under the guidance of the doctor for standardized treatment.