Squamous carcinoma of the lung is a pathological type of lung cancer, and basically, the symptoms of lung cancer are similar. The main symptoms include fever, cough, blood in sputum, chest pain, etc. The most important symptoms are: 1. The reason why squamous lung cancer causes fever is mainly due to obstructive pneumonia, which causes inflammatory fever. When central type lung cancer tumor grows, it firstly blocks the opening of lung segment or bronchus, causing obstructive pneumonia in the corresponding lobe or lung segment, which causes poor drainage and fever, and most of the fever in this category is around 38℃, rarely exceeds 39℃. Antibiotic treatment may be effective, and the shadows may be absorbed, but because of poor drainage of secretions, there are often recurrent episodes, so that in 1/3 of patients, pneumonia can occur repeatedly in the same area within a short period of time. If there are repeated episodes of pneumonia, repeated fever and shadow in the same area, the possibility of lung cancer should be highly considered; 2. Cough: cough is the most common symptom, and cough as the first symptom accounts for more than 35%-75%. Cough caused by squamous lung cancer may be related to changes in bronchial mucus secretion, obstructive pneumonia, pleural invasion, pulmonary atelectasis and other intrathoracic comorbidities. For patients who smoke or suffer from chronic bronchitis, if the cough is aggravated, frequency is increased, and the nature of the cough is changed, especially in the elderly, they should be highly alert to the possibility of lung cancer. 3. Blood in sputum or hemoptysis is also a common symptom of lung cancer. 30% of the patients have hemoptysis and blood in sputum as their first symptoms. Since tumor tissue is relatively rich in blood supply and fragile in texture. When coughing vigorously, the blood vessels will easily rupture and bleed. Coughing up blood may also be caused by local necrosis of tumor or blood vessel invasion, characterized by intermittent or persistent, repeated small amount of blood in sputum or small amount of hemoptysis, occasionally due to the rupture of large blood vessels or large cavities, uncontrollable hemoptysis may occur; 4. This is mainly related to the tumor may have invaded some nerves of chest wall.