Does lung cancer cause persistent cough?

Lung cancer may irritate or narrow an airway, leading to a cough that continues or changes from your usual pattern. The cough may be dry or may bring up mucus. Other features can include a hoarse voice, chest discomfort, breathlessness, wheezing, or blood-streaked phlegm. These symptoms can also occur with infections, asthma, reflux, allergies, smoking-related airway disease, or other conditions, so the symptom needs context rather than a self-diagnosis.

A clinician may ask when the cough began, whether it is worsening, what it produces, and whether you smoke or have had previous lung problems. Assessment can include listening to your chest and arranging tests when appropriate.

Arrange a medical appointment if a cough persists, returns repeatedly, or changes in character, especially if you smoke, used to smoke, or have a personal history of cancer. Record its duration, triggers, mucus or blood, breathlessness, fever, chest pain, and any medicines you take. Do not stop prescribed treatment without advice. A clinician can decide whether you need an examination, chest imaging, or another investigation.

Seek urgent medical help for coughing up more than a small streak of blood, severe or rapidly worsening breathlessness, blue or grey lips, confusion, fainting, or intense chest pain. If breathing becomes difficult suddenly, use your local emergency service. These warning signs require prompt attention regardless of whether cancer is suspected.

Ask: What could be causing my cough? Which changes should I monitor? Do I need a chest examination or imaging? Could my medicines, reflux, asthma, or an infection contribute? What should I do if I see blood or become short of breath?