Pulmonary arteriovenous fistula can be manifested as exertional dyspnea, cyanosis, cough, hemoptysis, neurological symptoms, infection, thrombosis and other manifestations, and the severity of clinical manifestations is related to the disease. 1. exertional dyspnea: due to the formation of abnormal traffic between the arteries and veins in the lungs, it will lead to oxygen deficiency in the blood of the body, which is manifested as dyspnea after activity and respiratory effort. 2. Cyanosis: one of the most common clinical manifestations of the disease, due to the reduced oxygen content of the blood entering the circulation, resulting in cyanosis of the skin. 3. Cough: when the pulmonary artery is involved in the pulmonary nerves, coughing may occur. 4. Hemoptysis: due to rupture of the pulmonary arteriovenous vein, resulting in coughing up blood. 5. Neurological symptoms: blood clots are formed in the blood vessels and dislodged into the intracranial blood vessels, which may lead to ischemia of the brain tissues, showing symptoms such as hemianopsia and hemiparesis. 6. Infection: due to the presence of pulmonary arteriovenous fistula, bacteria may enter the body circulation directly, which may lead to the formation of systemic abscess and local abscess. 7. Thrombosis: blood eddies may occur at the pulmonary arteriovenous fistula, which may lead to the formation of blood clots. It is recommended that people with the corresponding symptoms should consult a doctor in time, and then follow the doctor’s instructions for treatment after a clear diagnosis.