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There are many other possible underlying causes of coughing up blood, many of them quite serious. Because of the wide range of health issues that can cause this symptom, it is important to see a doctor when it occurs. These potential causes include: 1  trauma to the chest. 2  chronic obstructive pulmonary disease (COPD)âchronic bronchitis or emphysema. 3  foreign body/particles (such as a piece of food) caught in the lung.
To find out what's causing your cough your GP might: take a sample of any mucus you might be coughing up; order an X-ray, allergy test, or test to see how well your lungs work; refer you to hospital to see a specialist, but this is very rare; What causes coughs. Most coughs are caused by cold or flu. Other causes include: smoking; heartburn (acid reflux)