The cause of diaphragm upward movement is that the diaphragm is pulled or squeezed upward, which can be seen in thoracic lung lesions, phrenic nerve and diaphragm lesions, and huge occupying lesions in the abdominal cavity. 1. Thoracic lung lesions: lung lesions such as pulmonary atelectasis and post-lobar resection pull the diaphragm upward to fill and reduce the thoracic cavity cavity. 2. Phrenic nerve and diaphragmatic lesions: phrenic nerve injury or paralysis can lead to diaphragmatic atony, and the diaphragm moves upward under the negative pressure in the thoracic cavity and the extrusion of abdominal organs. Diaphragmatic lesions, such as diaphragmatic hypoplasia, can lead to diaphragmatic swelling and diaphragmatic upward movement. 3. Huge occupying lesions in the abdominal cavity: Huge occupying lesions in the abdominal cavity, such as enlarged spleen or enlarged liver, can also squeeze the diaphragm and lead to diaphragmatic upward movement. It is recommended that patients should go to the hospital in time to find out the cause of diaphragm upward movement and treat it positively.