Cirrhosis can cause diffuse pulmonary arteriovenous fistula. Pulmonary arteriovenous fistula is caused by congenital or acquired factors. Hereditary hemorrhagic capillary dilatation symptoms predominate among congenital factors, and acquired factors include diseases such as chest trauma, surgery, advanced cirrhosis, and metastatic tumors. Diffuse arteriovenous fistula caused by liver cirrhosis is also known as hepatopulmonary syndrome. Hepatopulmonary syndrome is formed under the combined effect of systemic metabolism and hemodynamic disorders, which can manifest as cyanosis, upright hypoxia, pestle finger, spider nevus, liver palm, ascites and other symptoms. Advanced cirrhosis can also have complications such as hepatic encephalopathy, upper gastrointestinal bleeding, hepatorenal syndrome, spontaneous peritonitis, hepatocellular carcinoma, etc., which need to be actively treated to improve the quality of survival. If you have cirrhosis or diffuse pulmonary arteriovenous fistula, it is recommended to consult a doctor to clarify whether the two are related.