Once small cell lung cancer develops liver metastasis, the symptoms are mainly the following: 1. digestive system symptoms, such as loss of appetite, poor appetite, wasting and other manifestations, and in severe cases, obvious decrease in albumin, ascites, etc. 2. if metastasis occurs to the hilar or bile duct area, obstructive jaundice can appear, and patients show obvious symptoms of yellow staining of skin and sclera. 3. small cell lung cancer with liver metastasis can also appear portal vein thrombosis, which may lead to symptoms of portal hypertension, such as ascites and even upper gastrointestinal bleeding. In conclusion, small cell lung cancer is prone to liver metastasis, and the main symptoms after liver metastasis are mainly digestive system symptoms, and of course, ascites and other clinical manifestations can also appear.