Scattered patchy streaky shadows in both lungs are observed on imaging tests, in which there is a distribution of scattered patchy or streaky hyperdense shadows in both lungs in low density, and the causes of formation are mainly related to pneumonia, smoking, tuberculosis, and pulmonary fibrosis. In pneumonia, a localized patchy hyperdense shadow is formed due to massive inflammatory exudation, and when the pneumonia is cured, localized foci of scarring are formed in the form of patches or striae. Foci of tuberculosis may also show localized hyperdense shadows, as well as evenly or unevenly distributed, corn-like, hyperdense nodular shadows. Pulmonary fibrosis is the result of abnormal repair of normal alveolar structure after inflammatory stimulation, which is manifested as patchy or striated high-density shadows in the lungs. In addition to the above, long-term smokers will appear in the lungs of a small number of striated shadow, there may be other reasons, it is recommended that the patient actively to the hospital, a clear diagnosis, in the doctor’s instructions under the use of medication, do not take their own medication, so as not to delay the condition.