Eosinophilic pneumonia refers to eosinophilic infiltration of the lungs, with or without peripheral blood eosinophils, and is classified as acute or chronic. Eosinophilic pneumonia may be due to Loeffler syndrome, tropical pulmonary eosinophilia, allergic bronchopulmonary aspergillosis, drugs, or toxins; it may also be of unknown cause, such as acute eosinophilic pneumonia, chronic eosinophilic pneumonia, and allergic granulomatous vasculitis. Chronic eosinophilic pneumonia has an unknown cause and can lead to symptoms such as dyspnea, cough, and fever. Patients with eosinophilic pneumonia have eosinophilic infiltrates in the lungs and may have eosinophilia in the blood, and X-rays may show dense alveolar exudates in the outer bands of the lungs with a clear central band. When patients suffer from eosinophilic pneumonia, they need to be actively treated with glucocorticosteroids, such as budesonide, under the guidance of a doctor, and the drugs need to be applied appropriately according to the doctor’s instructions.