Heart failure is the final stage of cardiovascular disease development, which is dangerous and has high mortality rate, and if not recognized early, the prognosis is often poor. After entering old age, due to the aging of the systemic organs, declining function and slow neurological response, the symptoms of heart failure in the elderly are atypical and elusive! 1, cough, shortness of breath resembles bronchitis, asthma Left heart failure is often initially manifested as frequent dry cough or chest tightness and shortness of breath, especially during activity and exertion. Some suddenly wake up at night, shortness of breath, forced to sit up after the symptoms are gradually relieved. This is due to left heart failure resulting in pulmonary stasis and bronchial mucosa edema, increased secretions, so that the airflow of the whistle is blocked. Because the elderly mostly have a history of chronic lung diseases (such as chronic bronchitis, emphysema, etc.), when heart failure is highlighted by symptoms in the whistle, it is often misdiagnosed as bronchitis or asthma attacks. 2, poor appetite, abdominal distension, diarrhea looks like gastroenteritis This condition is mainly seen in right heart failure. Due to the obstruction of blood return from the right heart, the venous pressure in the body circulation increases, leading to stasis of blood in the internal organs (gastrointestinal tract, liver, bile, etc.), resulting in loss of appetite, abdominal distension, nausea, vomiting and other symptoms, and in severe cases, abdominal pain and diarrhea due to ischemic spasm of the gastrointestinal smooth muscle. Without detailed history and physical examination (right heart failure usually has positive signs such as hepatomegaly, swelling of lower limbs and jugular vein anger), it is easy to be misdiagnosed as chronic gastroenteritis and other gastrointestinal diseases. 3.Low urine and swelling appear to be kidney diseases Heart failure patients have reduced total 24-hour urine volume and relatively more nocturnal urine due to reduced cardiac output, stasis of blood in the body circulation, reduced effective circulating blood volume and insufficient renal blood flow. This is due to increased return blood volume during the nocturnal state of resting flat on the back of the heart. Unlike renal disease, cardiogenic edema tends to start in the lower part of the body (ankles and calves), whereas renal edema often appears first on the face. In addition, patients with cardiogenic edema tend to have normal urinary routine and are accompanied by other signs and symptoms of heart failure.