What can cause you to cough up dark-brown phlegm?

There are several possible causes for coughing up dark-brown phlegm. Here are a few:

1. Smoking: Smoking can irritate the airways and cause inflammation, leading to the production of dark-brown phlegm.

2. Air pollution: Inhaling pollutants such as dust, smoke, or chemicals can irritate the airways and cause coughing up of dark-brown phlegm.

3. Chronic bronchitis: This is a long-term inflammation of the airways. It can cause coughing up of dark-brown phlegm that may be tinged with blood.

4. Pneumonia: This is an infection of the lungs. It can cause coughing up of dark-brown or rust-colored phlegm, which may be tinged with blood.

5. Tuberculosis: This is a bacterial infection that primarily affects the lungs. It can cause coughing up of dark-brown or greenish-yellow phlegm, which may be tinged with blood.

6. Bronchiectasis: This is a condition in which the airways become widened and damaged. It can cause coughing up of dark-brown or greenish-yellow phlegm, which may be tinged with blood.

7. Lung cancer: This is a type of cancer that starts in the lungs. It can cause coughing up of dark-brown or blood-tinged phlegm.

8. Other medical conditions: Certain other medical conditions, such as heart failure, liver disease, or certain medications, can also cause coughing up of dark-brown phlegm.

It is important to see a doctor if you are coughing up dark-brown phlegm, especially if it is accompanied by other symptoms such as shortness of breath, chest pain, fever, or weight loss. The doctor can determine the cause of the dark-brown phlegm and recommend appropriate treatment.