Hematocrit is the sedimentation rate of erythrocytes, high hematocrit means that red blood cells settle faster under certain conditions, and the causes are mainly divided into physiological factors and pathological factors. 1. Physiological factors: physiological factors generally include menstruation, pregnancy and postpartum, due to the hormone level in the patient’s body has changed significantly, so the rate of red blood cell sedimentation is faster, and there is no relationship with the disease, and will not have an impact on the patient’s body. 2. Pathological factors: patients with acute inflammation, active tuberculosis, severe tissue destruction or anemia will lead to faster rate of blood sedimentation. Blood sedimentation has certain suggestive value for malignant tumors, and the nature of tumor can be preliminarily judged through pathological examination and blood sedimentation. If abnormal blood sedimentation is found, it is recommended to consult the doctor in time and standardize the diagnosis and treatment under the doctor’s guidance.