The evaluation of the lung has usually been considered off-limits for ultrasound, because ultrasound energy is rapidly dissipated by air. Lung ultrasound is not useful for the evaluation of the pulmonary parenchyma and the pleural line. However ultrasound machines have become more portable, with decreased start-up time, while simultaneously providing improved image quality and ease of image acquisition. Additionally, lung ultrasound is highly accurate for the diagnosis of pneumothorax, hemothorax. pleural effusions, pulmonary edema (cardiogenic or noncardiogenic), interstitial syndrome, and pneumonia. These factors make lung ultrasound suitable for operating rooms, intensive care units, and emergency departments. Adequate interpretation of lung ultrasonographic findings, including artifacts, requires some training and experience. Since lung ultrasound abnormalities, however, are well defined and easy to recognize, learn and reproduce, operator dependence is minimal. So let's try lung ultrasound! In this article, the author will discuss the examination method for adequate lung ultrasonographic images, lung ultrasonographic findings and signs, leading to the diagnosis.