ESR is the abbreviation of erythrocyte sedimentation rate, which refers to the rate of erythrocyte sedimentation under certain conditions, and ESR is affected by many factors.ESR has physiological acceleration, and the common reasons are children under 12 years old, elderly people over 60 years old, women’s menstrual period and pregnancy for more than 3 months, the blood sedimentation can appear physiological acceleration. Pathological increase in ESR is commonly seen in: i. Inflammatory diseases, especially in acute bacterial inflammation, as well as tissue injury and necrosis, including acute myocardial infarction; ii. Malignant tumors, especially those that are rapidly growing; and rheumatic diseases, such as rheumatoid arthritis and systemic lupus erythematosus, etc.; and iii. Anemia in patients with anemia, where the ESR increases due to the reduction of friction between the red blood cells. .