- Coughing blood (haemoptysis).
- Accumulation of fluid / pus in the lung cavity (pleural effusion / empyema).
- Accumulation of air in the lung cavity (pneumothorax).
- Lung infections due to other bacteria or fungi.
- Tuberculosis in larynx.
- Tuberculous enteritis or ischiorectal abscess: Swallowing of heavily infected sputum can cause infection in the intestines.
- Spread of tubercular infection to other parts of body through blood (blood borne dissemination).
- Respiratory failure and Right Heart failure are late complications and occur when lungs are extensively damaged by the disease.