Blood is the source of life and health, blood is undoubtedly very important to the human body. If the body lacks blood, it belongs to anemia. Once anemia occurs, the body will appear all kinds of discomfort phenomenon, that is, the body will send out signals of anemia. Once these anemia signals appear, we need to be vigilant whether anemia. Anemia after the body issued the following signals: a, unexplained dizziness, if the frequent occurrence of dizziness, then it is usually related to anemia. There is also a relationship with cardiovascular and cerebrovascular lesions, especially may be a precursor to stroke. Secondly, anemia may cause shortness of breath or difficulty in breathing, which is mostly due to hypoxia or hypercapnia in the respiratory center. Third, anemia may also cause fatigue and drowsiness, which is due to lack of oxygen to the muscles. This is the most common and earliest symptom of anemia. Fourthly, anemia may cause loss of appetite, abdominal distension, nausea, constipation, etc. This is the most common symptom of anemia. Fifth, anemia will appear headache, tinnitus, blurred vision, poor concentration, drowsiness and so on are common symptoms. Fainting and even blurring can occur in the severe or acute anemia, especially in elderly patients. Six, when the nail color white, must be careful of anemia. Especially diabetic patients, because of the reason of long-term medication, will cause damage to the human blood system, it is very likely that the phenomenon of anemia. Seven, anemia in women patients often have menstrual disorders, such as amenorrhea or menorrhagia. Loss of libido is common in both sexes. Eight, anemia is the skin, mucous membranes, conjunctiva, and skin capillary distribution and contraction state and other factors. It is generally believed that the color of the eyelid conjunctiva, the palm of the hand and the color of the nail bed is more reliable. Nine, severe anemia may have mild proteinuria and urinary concentration function is reduced. Ten, palpitations for anemia is one of the most prominent symptoms, there is tachycardia, in the apical or pulmonary valve area can be heard soft systolic murmur, known as anemic murmur, severe anemia can be heard diastolic murmur. Eleven, forgetfulness, if the phenomenon of forgetfulness occurs at a young age, it is likely to be related to the lack of red blood cells in the body, which will easily cause anemia.