Lung cancer is very harmful, and if we want to get rid of it as soon as possible, we should pay attention to the treatment method, but we also need to pay attention to the prevention matters in our life, so that we can prevent the disease as soon as possible and live a pain-free life is the key. When metastatic lung cancer occurs, it will make other body organs also become diseased, and then it will be difficult to treat. What are the symptoms of metastatic lung cancer: 1. Coughing up blood and bloody sputum Coughing up blood is also one of the first symptoms of lung cancer, and although its incidence is lower than that of cough, its diagnostic significance is more serious than that of cough. It is characterized by intermittent and repeated small amount of bloody sputum, often with more blood than sputum and more colorful, and sometimes it is not easy to control. When the cancer erodes the blood vessels, it may cause a large cough of blood. The blood sputum comes from the tumor area, mixed with a large number of cancer cells, and the rate of sputum cell blood detection is very high; 2. Fever There are two kinds of fever caused by lung cancer, one is inflammatory fever caused by bronchial obstruction or wall compression, and the other is the so-called “cancer fever”. The other one is the so-called “cancer fever”, which is caused by the toxin produced by tumor necrosis and often appears after extensive transformation at a later stage; 3. Chest pain When the tumor is located near the pleura, it is easy to produce irregular dull pain, and when the ribs and spine are invaded, it can also have continuous chest pain and pressure pain. If the tumor presses the intercostal nerve, the chest pain will be in the area where the nerve travels. Involvement of mediastinal lymph nodes may cause deep posterior sternal pain, and cancer near the diaphragm may cause pain in the cardiac fossa. Usually, chest pain appears earlier in patients with undifferentiated carcinoma and later in squamous carcinoma, which is due to mediastinal lymph node metastasis in the early stage of undifferentiated carcinoma; 4, chest tightness and shortness of breath Bronchial stenosis and obstruction cause shortness of breath, and metastasis is seen in central type lung cancer. Diffuse fine bronchial-alveolar cell carcinoma reduces the breathing area and affects diffusion function, and shortness of breath progressively worsens. Concurrent pleural effusion, cancerous lymphangitis and septal muscle paralysis caused by tumor compression of septal nerve can also cause shortness of breath. Advanced lung cancer may cause shortness of breath or even asphyxia due to extensive lesions or metastatic lymph nodes compressing the trachea and rongeur; 5.cough is the most common early symptom. The cancer stimulates the bronchial mucosa and causes dry cough with no sputum or a small amount of white foamy mucus sputum. When the tumor enlarges and causes bronchial stenosis, the cough is aggravated and is mostly persistent with a high-pitched metallic sound, which is a characteristic obstructive cough. When there is secondary infection in the lung distal to bronchial wall narrowing, the sputum volume increases and presents mucus thick sputum; 6. Symptoms caused by tumor compression or invasion The tumor itself or enlarged lymph nodes can compress adjacent organs and produce different symptoms. For example, compression of laryngeal nerve may cause hoarseness; compression of esophagus may cause difficulty in swallowing; compression of superior vena cava may cause bruising, varicose veins and edema in the head, face and anterior chest; 7.Wasting and cachexia Late stage patients may suffer from loss of appetite due to infection and pain, and consumption caused by tumor toxin may cause wasting and gradually develop into cachexia.