The erythrocyte sedimentation rate, referred to as hematocrit, is the rate of sinking of red blood cells within one hour when peripheral blood is drawn from a patient and placed in a test tube, which is 0-15 mm/h for adult males and 0-20 mm/h for adult females. The blood sedimentation is increased, such as acute pneumonia, appendicitis, perianal infection, etc. will cause increased blood sedimentation. Rheumatic diseases, such as rheumatoid arthritis and systemic lupus erythematosus, can cause an abnormal increase in blood sedimentation. Tuberculosis infection, such as pulmonary tuberculosis, tuberculous pleurisy, lymph node tuberculosis, etc., can cause a significant increase in blood sedimentation. Fourth, it can be seen in some tumor patients, such as lung cancer, liver cancer, gastric cancer, etc., all will have abnormally fast blood sedimentation. Therefore, increased blood sedimentation is not specific, but often represents a pathological state.