Lung streak shadows are not necessarily scary and depend on the exact nature of the shadowed area. When lung films are performed, in most cases they are benign lesions that may be caused by some bacterial and viral infections in the lungs. In this case, it is not scary, usually under the guidance of the doctor, through the use of drugs or IV can make the disease relief. However, a very small number of patients may also be caused by lung tumors, if it is a malignant tumor, not timely resection, there may also be spread, and serious life-threatening. At this time, timely resection is required, and may also need to be given through radiotherapy or chemotherapy to assist in the treatment.