Cough can be caused by many conditions including asthma, allergic disorders, nasal and sinus conditions, smoking-related lung disease, chest infection, bronchiectasis, fibrosis and lung cancer. For this reason, individuals with a persistent cough should seek expert advice and evaluation to permit targeted therapy.

Investigations may include:
• lung and sinus imaging
• allergy and immunology investigations
• detailed lung function testing
• sputum analysis
• screening for gastro-oesophageal reflux.