Pallor can be caused by a variety of reasons, sometimes due to shock, tension, fear, etc., resulting in a short period of intense vasoconstriction of the face, which can cause pallor, which is usually a transient manifestation that can be quickly relieved, and there is no major problem. There are also common diseases that cause pallor are blood disorders, the most common is anemia, including iron deficiency anemia, aplastic anemia and so on, due to the reduction of hemoglobin content in the blood of the face skin, so the face will look pale. Then there are other cardiovascular diseases, including upright hypotension can cause insufficient vascular perfusion in the face, resulting in a pale face. For example, some other malnutrition, hypothyroidism and lead poisoning may affect the normal skin color of the face, resulting in pale performance, so the appearance of pale face, must carefully analyze the causes, if necessary, to do relevant tests to clarify, and then targeted treatment.