Chronic Obstructive Pulmonary Disease (COPD) is characterized by non-reversible chronic airway obstruction associated with co-morbidities and is the third leading cause of death worldwide. Its evolution is punctuated by successive exacerbations precipitating the progression of the disease and its co-morbidities. The most severe exacerbations are the source of frequent hospitalizations that strongly affect the patient's quality of life and are associated with increased mortality. The diagnosis of exacerbation is mainly clinical but patients frequently consult their doctor too late which may lead to delays in care. However, the early detection and management of these exacerbations can reduce their impact and in particular avoid hospitalization or shorten their duration.