Distant metastasis of lung cancer refers to metastasis to other organs outside the chest cavity, commonly brain metastasis, bone metastasis, abdominal metastasis and distant lymph node metastasis, and the common pathological types include small cell lung cancer. Metastases to the brain can cause intracranial hypertension, and patients most often experience headache, nausea, jet-like vomiting, abnormal mental status, unsteady walking, and may also have seizures, disorientation and speech impairment, and in severe cases, lethargy and coma. Bone metastases can cause bone pain and pathological fractures. Patients may experience peripheral pain and sometimes pressure pain at fixed sites. Metastasis to the spine compresses the spinal cord and can lead to paralysis of the lower extremities and incontinence. Metastasis to the abdominal cavity will manifest as digestive symptoms. Metastasis to the liver will result in pain in the liver area, jaundice, nausea and vomiting, metastasis to the peritoneum will result in peritoneal effusion and abdominal distention, and metastasis to the gastrointestinal tract will result in intestinal obstruction, diarrhea and constipation. Metastasis to distant lymph nodes refers to supraclavicular lymph nodes, which may be asymptomatic. On examination, the lymph nodes in the supraclavicular region will be fixed, hard and fusible, but painless.