Many patients born prematurely who developed bronchopulmonary dysplasia (BPD) as neonates are now approaching adulthood. Adults with BPD are at increased risk for respiratory difficulties including respiratory and lung function disorders. Respiratory symptoms include wheezing, cough and dyspnoea. In adult BPD patients lung function is impaired, notably by bronchus obstruction, hyperreactivity and reduced diffusion capacity; exercise capacity is also diminished. The pathophysiology of BPD is not identical to that of asthma and standard treatment for asthma is therefore not effective. Premature infants are currently treated with surfactant therapy that results in less intensive artificial respiration and oxygen being required. The classical BPD clinical picture that results from tissue damage and scarring is therefore becoming less common but another new BPD picture is emerging. This is characterised by large irregularly formed sacculi and alveoli with septation only just beginning and poor vascularization. Patients with chronic respiratory symptoms who were born prematurely should therefore undergo comprehensive testing, including detailed lung function tests and exhaled nitric oxide levels.