The cause of diaphragmatic pain is usually due to inflammatory stimulation or spasm of the diaphragm, and the common causes include lesions in the thoracic cavity, abdominal cavity, mediastinal diseases, and lesions of the diaphragm itself. 1. Thoracic organ lesions: lung infection, tuberculosis, lung cancer and other diseases, infection or tumor stimulation of peripheral nerves of the diaphragm can also cause diaphragmatic pain. 2. Diseases of abdominal organs: liver cancer, liver abscess, stomach cancer, spleen tumor and other diseases can cause diaphragm pain when they invade the diaphragm. 3. Mediastinal diseases: the phrenic nerve travels from the neck to the diaphragm through the mediastinum, and mediastinal diseases such as mediastinal tumor, thoracic aortic aneurysm, esophageal cancer, esophagitis, etc. can stimulate the phrenic nerve and cause diaphragmatic pain. 4. Diseases of the diaphragm itself (1) Diaphragmatic spasm caused by various reasons can cause diaphragmatic pain. (2) Diaphragmatic hernia, subphrenic abscess when pulling the diaphragm can also cause diaphragmatic pain. (3) Trauma or penetrating injury to the diaphragm can cause diaphragm pain. Patients with diaphragm pain are advised to go to the hospital for further treatment.