Heart muscle cells will not be edematous and clinically there is no cardiac edema. Heart failure will appear in the late stage of various diseases and discomfort will appear in the early stage of heart failure. Most of them are due to poor control of the primary disease in patients with hypertension, coronary heart disease and respiratory diseases, and heart failure appears at the end stage. In the early stage, the symptoms are not typical and most people will ignore them, there may be chest tightness, shortness of breath, slight wheezing, especially after activity the above symptoms are obvious, and at night there may be coughing symptoms as soon as lying down, and the cough medicine does not relieve. Some people will have nausea after eating, indigestion, mild swelling of both lower limbs, with lighter symptoms in the morning and heavier symptoms in the afternoon and night. If you have the above symptoms, you should pay attention to them and go to a professional hospital to improve ECG, cardiac ultrasound and BNP examination for early treatment.