The treatment of dyspnea, or difficulty in breathing, in advanced cancer varies according to the causes. The main causes of dyspnea in advanced cancer patients are as follows: 1. Tumor compression of trachea leading to airway obstruction, mainly seen in lung cancer such as lung cancer, which can be treated by radiation therapy to quickly reduce the size of the mass and release the compression. It can also be treated with respiratory intervention to install a stent in the trachea to hold up the compressed airway. 2. Cancer metastasizes to the pleura, resulting in a large amount of fluid in the pleural cavity compressing the lung tissue, which is mostly seen in lung cancer. At this time, thoracentesis and drainage are adopted to drain the pleural fluid and relieve the compression. 3. Advanced cancer leads to severe anemia, which causes breathing difficulties. The treatment method is simple: infusion of red blood cells to improve the level of hemoglobin to correct the anemia. 4. Other rare causes, such as cancer can lead to spontaneous pneumothorax, that is, the outside gas enters the chest cavity and restricts the expansion of the lung when breathing, closed drainage of the chest cavity can be used to drain out the gas inside. For example, cancer can lead to spontaneous pneumothorax, which means that outside gas enters the chest cavity and restricts the expansion of the lung during breathing. In conclusion, there are many causes of dyspnea in advanced cancer patients, and the treatment methods are different for different reasons, but in the final analysis, the above treatment methods are all stopgap methods, which can temporarily relieve the symptoms, but the most important thing is to adopt effective methods to control the growth of tumor in order to solve the fundamental problem.