Pulmonary eosinophilia is a heterogeneous group of diseases characterized by infiltration of eosinophils in all parts of the lungs. Various infections, drugs, malignancies, autoimmune and idiopathic processes can be the cause, but the most common in the world is parasite infestation such as ascariasis and strongyloidosis. Pulmonary eosinophilia, depending on whether we know the cause or not, can be divided into primary or idiopathic and secondary or extrinsic. Acute eosinophilic pneumonia, chronic eosinophilic pneumonia, hypereosinophilic syndrome and Churg-Strauss syndrome belong to primary pulmonary eosinophilia, while allergic bronchopulmonary aspergillosis and pulmonary eosinophilia that occur as a result of parasite infestation, radiation, drug intake or malignant diseases belong to secondary pulmonary eosinophilia. Although the clinical picture is not identical in all types of pulmonary eosinophilia, the most common symptoms are cough, shortness of breath, wheezing and a level of respiratory failure and systemic symptoms such as fever, loss of appetite and/or weight loss and malaise. The diagnosis is based on the picture, detailed history and diagnostics that include blood tests, radiographic imaging of the lungs such as X-ray along with HRCT and bronchoscopy with or without lung biopsy, BAL analysis and pulmonary function tests. Most patients with pulmonary eosinophilia are treated with systemic corticosteroids as well as antihelmintics and antifungal drugs if the causative agents are parasites or fungi.