The most feared signs of heart failure are some signs and symptoms that indicate an aggravation of the condition, such as worsening of chest tightness and dyspnea, coughing up blood, worsening of edema, and the appearance of pleural effusion and abdominal effusion. But to assess the severity of heart failure need to further go to the hospital to improve laboratory tests. Heart failure if the patient suddenly some serious symptoms, signs, or progressive aggravation of the original symptoms, often suggests that the condition is aggravated, is a danger signal of heart failure. For example, the patient suddenly appeared progressive aggravation of dyspnea, can not lie down, open-mouth breathing, accompanied by sweating, irritability, some may also cough up blood, these are suggestive of acute attack of left heart failure, the need to go to the hospital as soon as possible to consult the treatment. If the patient usually exists in the lower limbs edema, edema recently spread upward, edema aggravation, and even the signs of pleural effusion, abdominal fluid, suggesting that the right heart failure aggravation, and some will have a typical hepatic jugular venous reflux sign. But to determine whether the heart failure is aggravated, not only to look at the symptoms, but also need to be combined with the patient’s laboratory test results to assess. For patients with heart failure who experience acute exacerbation of the above symptoms, it is important to be vigilant and go to the hospital as soon as possible for treatment.