Coughing up blood is a relatively common occurrence, and there are several common causes: firstly, there may be a cough that leads to pharyngitis, bronchitis or pneumonia, and the inflammatory areas are congested and edematous, which can be irritating at this time and lead to a cough. The second aspect is that congestion and edema can also ooze blood cells, so the coughing and coughing up blood can occur. This condition is often relatively simple to treat, mainly with anti-inflammatory drugs. However, some cases are more complicated, such as coughing due to bronchial dilatation, and coughing up blood is often caused by the rupture of small arteries or veins around the bronchial tubes due to the dilated bronchial tubes, so coughing up blood can occur. It is important to treat the dilated bronchial tubes, for example, by patting the back every morning, and it is very important to expel sputum. The third aspect of coughing and coughing up blood may also be tuberculosis, so you should go to a regular tuberculosis hospital for anti-tuberculosis treatment.