There is no such thing as three clinical indicators of heart failure. In general, heart failure can be determined by combining symptoms and signs with laboratory and imaging tests. 1. Clinical symptoms and signs: Heart failure includes left heart failure and right heart failure. Left heart failure is usually characterized by sitting breathing, dyspnea, inability to lie down, and in severe cases, spitting pink foamy sputum. Right heart failure will appear hepatosplenomegaly, bilateral lower extremity edema, abdominal fluid, jugular vein varicose and other symptoms. 2. Laboratory and imaging tests: Laboratory tests mainly show that BNP is continuously elevated (the normal value of BNP is 0-100pg/mL); chest radiographs show pulmonary bruising, and cardiac ultrasound shows decreased ejection fraction or diastolic insufficiency. These are all diagnostic indicators of heart failure. Of course, there are other indicators of heart failure for reference, and it is recommended that if symptoms occur, consult a doctor in time to identify the cause and actively cooperate with the doctor’s treatment to avoid serious consequences.