Sedimentation refers to the rate of sedimentation of red blood cells. If the blood is left to stand, there is a tendency for the red blood cells in the blood to fall, but the tendency is slow.1 The condition of increased sedimentation refers to a rate of fall of red blood cells of more than 15 mm/hour in 1 hour, which is for men and more than 20 mm/hour for women. This condition may have physiological causes, such as women during menstruation or more than 3 months of pregnancy, children under 12 years of age, or senior citizens, can also have a slight increase in blood sedimentation, which may be related to physiological anemia, or to an increase in the content of certain proteins in the blood. 2. Regarding pathological conditions, it can be seen in infections, when there is a bacterial infection, an inflammatory reaction, 2-3 days of time, can appear an increase in blood sedimentation. In other cases, such as malignant tumor, lymphoma, anemia, myocardial infarction, etc., the blood sedimentation can be increased.