When to worry about persistent cough with lung cancer

A lung tumour can irritate an airway or alter how mucus moves. Cough can also reflect infection, reflux, allergies, treatment effects, or fluid around the lung. Tell your team if the cough becomes harsher, produces new mucus, interrupts sleep, follows treatment, or comes with chest pain, fever, wheezing, or breathlessness. A change does not identify its cause by itself, but it deserves clinical review.

Record when coughing occurs, whether it is dry or productive, the colour of mucus, and any triggers. Contact your oncology team promptly if the cough is worsening, prevents rest, or is not helped by the agreed plan. Avoid smoke and ask before taking over-the-counter cough medicines, since some may interact with treatment or hide important changes.

Seek urgent help for coughing up more than a small streak of blood, severe breathlessness, blue or grey lips, chest pressure, sudden confusion, fainting, or an inability to speak in full sentences. A rapidly worsening cough with fever or shaking chills also needs prompt assessment.

Ask which cough changes should prompt a same-day call, whether your medicines can cause cough, and which inhalers or soothing measures are safe. Ask how to distinguish an expected treatment effect from infection or fluid.