An elevated diaphragm is usually caused by a problem in the diaphragm, below the diaphragm or above the chest. Problems that affect these areas that may lead to an elevated diaphragm include hematoma, lung fibrosis, a cyst, lung cancer, pulmonary embolus and a rib fracture.
Visiting a doctor for a diagnosis will help to pinpoint the main underlying cause of the elevation. An elevation that occurs at the chest is usually due to a dysfunction, as stated by MedicineNet. The condition can be detected through physical examination, such as a CT or an X-ray. Usually, treating the underlying condition can help correct this condition.