Yellow face alert four diseases is not true, because yellow face more than four diseases, there are many factors may lead to yellow face, such as physiological factors, anemia, liver disease, etc.. 1. Physiological factors: yellowish color may be due to long-term late night, improper rest, not enough sleep; may also be due to long-term exposure to ultraviolet radiation and other factors, these are not pathological factors, so the yellowish color alert four diseases is not true. 2. anemia: for example, iron deficiency anemia, thalassemia, etc., when the body’s blood volume changes, resulting in a decrease in red blood cells and hemoglobin, easy to cause yellow or pale. 3. Liver disease: for example, hepatitis cirrhosis, liver cancer, etc., when the condition gradually aggravated, resulting in elevated jaundice, induced by the rise of bilirubin in the body, it may cause yellowing of the sclera. In addition to the above points, yellowing of the face may also be related to endocrine disorders, bile duct diseases. If yellowing of the face occurs for a long time, it is recommended to consult a doctor in time and test the bilirubin to find out if it may be high. If necessary, liver ultrasound, liver function and other tests are needed to analyze the cause.