Most common conditions: viral, bacterial, inflammatory, fungal respiratory diseases. Pathology of the upper respiratory tract (laryngeal hemiplegia, dorsal displacement of the soft palate, ethmoid hematoma, infection or mycosis of the guttural pouches, sinus disease).

Complementary examinations that can be performed: blood tests, endoscopy at rest, dynamic endoscopy during effort, tracheal lavage, bronchoalveolar lavage, measurement of arterial blood gases.