Lung puncture is needed when there are unexplained lung occupations and lung lesions. 1. Lung space occupation: when there is a space-occupying lesion such as a tumor in the lung, a puncture biopsy is needed to examine the pathology of the tumor. 2. Lung lesions: Patients with unexplained lung lesions, including interstitial lesions or infectious lesions, also need to undergo lung puncture to clarify the nature of the lesion and the cause of the lesion. Lung puncture can detect many diseases, but the specific need for lung puncture should be decided by the doctor after a full body examination in the hospital.