Anemia is a more common symptom rather than a disease, and more diseases can have anemia. How to know the presence of anemia can be traced or checked from several aspects: 1. whether there are causes of anemia in anemic patients, such as whether certain women have excessive menstruation, whether patients with hemorrhoids bleed a lot, or stomach bleeding, and whether patients with stomach disease have lost blood; 2. whether there are some symptoms of anemia, such as dizziness, weakness or poor appetite, or even severe shortness of breath, and some may also have dry hair and skin, all of which are some manifestations of anemia. To diagnose anemia, it is crucial to go to the hospital for examination, such as routine blood test, in which there is a number for hemoglobin concentration, if the hemoglobin is lower than the normal standard, it is called anemia. Because of the difference between men and women, hemoglobin less than 120g/L for men, less than 110g/L for women and less than 100g/L for pregnant women can be diagnosed as anemia, but the cause of anemia needs to be further investigated and treated by following the vine. According to the severity of anemia, it is often divided into mild, moderate, severe and very severe. 9g/dL-12g/dL or about 11 g/dL is called mild anemia; 6g/dL-9g/dL is moderate anemia; below 6g/dL is severe anemia, and if it is lower than 3g/dL, it is very severe anemia. g/dL is usually used on the unit, while g/L is usually used on the lab sheet, which is multiplied by 10 for conversion .