Why does tuberculosis cause cough?

Tuberculosis, or TB, can involve the lungs and cause the immune system to react around areas of infection. Inflamed airway lining and lung tissue become sensitive, so coughing helps clear mucus and material from the airways. The cough may be dry or bring up phlegm, and its pattern can change as the illness evolves.

Cough is a common presentation of Tuberculosis. A cough has many possible causes, so it needs a clinical assessment rather than assumptions based on the symptom alone.

Arrange a medical assessment for a persistent or worsening cough, particularly with fever, night sweats, unexplained weight change, tiredness, chest discomfort or coughing up blood. The clinician may ask about close contacts, travel, previous TB exposure and immune health, then choose appropriate examinations and tests.

If TB is diagnosed, take treatment exactly as prescribed and keep follow-up appointments. Ask the treating team about measures to reduce passing an infection to others, including advice for people sharing your home or workplace.

Seek urgent care for coughing up blood, increasing shortness of breath, chest pain, confusion, fainting or a cough that makes breathing difficult. Emergency care is appropriate when breathing is severely affected or blood loss is more than a streak. For other ongoing cough symptoms, do not delay arranging a clinician review.

Ask what is causing the cough, which tests are being used to check for TB, and when results will guide the next step. If treatment is started, ask how to take it safely, what side effects should be reported and how to protect close contacts.