The development of lung cancer is closely related to many factors, and many bad habits, such as smoking, alcoholism, and excessive diet, are capable of developing lung cancer. For everyone to have a healthy body, besides paying attention to their own health, they must go to the hospital for examination in time when they find symptoms of discomfort, because the symptoms of some diseases are not so obvious, and lung cancer is the most common one. How to diagnose lung cancer? Early symptoms of lung cancer are mainly boring pains, hidden pains, and the location is not certain, and the relationship with breathing is not certain. If swelling and pain continue to occur, it indicates that the cancer may involve the pleura. Early symptoms of lung cancer are often mixed with sputum and appear intermittently or intermittently. Many lung cancer patients are diagnosed with sputum and blood. 3.Coughing lung cancer usually causes irritation in the respiratory tract because it grows on the bronchopulmonary tissue, which is also a common early symptom of lung cancer. 4.Low fever often exists in the obstructive lobe of lung after the tumor blocks the bronchus, the degree of which varies from low fever in mild cases to high fever in severe cases. This is one of the more common early symptoms of lung cancer. The diagnosis of lung cancer mainly includes: 1. Firstly, frontal and lateral chest radiographs can be performed: bronchial lung cancer is divided into central type and peripheral type. Peripheral type lung cancer accounts for about 80%. Early diagnosis of central type mainly relies on cancer cytology and bronchoscopy, and X-ray plain film can show secondary obstructive changes. For early detection of peripheral lung cancer, radiographs play an important role. Despite the availability of multiple complex and advanced imaging techniques, radiography is still the imaging method of choice for lung cancer screening. 2. And also chest CT can be chosen: In terms of lesion detection, some reports point out that spiral CT is 40% more powerful than X-ray plain film in showing lung nodules. Due to the large amount of X-rays and the high cost of this method, it cannot yet be used as a routine physical examination. Brain CT/NMR can also be performed: Lung cancer is prone to brain metastasis, so brain examination should be performed before treatment to clarify the diagnosis, and MRI is better than CT. Bone scan can also be chosen: 3% of lung cancer patients have bone metastasis as the first symptom, and about 30%~40% of patients in the progressive stage will have bone metastasis. The most commonly used bone imaging technique is radionuclide bone scan. Patients with positive lesions suggested by bone scan, especially those with multiple bone metastases in weight-bearing bones, should undergo CT and magnetic resonance imaging (MRI) for further differential diagnosis. 4. If the above symptoms are found to be ineffective after one week of treatment, patients should seek professional consultation as soon as possible.