Bronchial lung cancer can cause fever in patients. There are two general causes: one is caused by ischemic necrosis of lung cancer tissue, and the other is caused by infection due to obstruction of bronchi by lung cancer tissue or decreased resistance in patients with pulmonary cachexia. Usually the latter is due to the difficulty of treating the primary disease, which usually results in feverish symptoms that will be repeated over and over again.
Patients with advanced lung cancer develop fever because, on the one hand, the lung cancer tissue grows rapidly, but the blood supply cannot catch up with the tissue growth, and the lung cancer tissue becomes partially necrotic, and the necrotic tissue will enter the bloodstream with the blood vessels and become an endogenous pyrogen, and the pyrogen can cause fever in patients. On the other hand, the tumor growth of advanced lung cancer patients will obstruct the bronchial tubes, resulting in obstructive pneumonia and infectious hyperthermia, if not treated for lung cancer. The factor of obstructing bronchial tubes persists. As for pneumonia, it is easy to recur again after pneumonia. Thus, recurrent fever and cough occur. Meanwhile, the cachexia of advanced lung cancer patients leads to the decrease of patients’ resistance. Various infections are also more likely to occur than normal, which is also a reason for recurrent findings in patients with advanced lung cancer.