A blood sedimentation rate of 40mm per hour is on the high side and is a serious phenomenon. The full name of hematocrit is erythrocyte sedimentation rate, which refers to the rate of blood sedimentation under certain conditions. The normal blood sedimentation parameter for female adults is 0-20mm, and for men it is around 0-15mm, so the blood sedimentation rate of 40 is on the high side. High blood sedimentation is not a specific diagnostic indicator of disease, and increased blood sedimentation itself does not cause any harm, but it is necessary to be alert to the common diseases that cause increased blood sedimentation, such as bacterial, viral, tuberculosis and fungal infections that can lead to an increase in blood sedimentation, and arthritis, SLE, and malignant tumors that can lead to accelerated blood sedimentation. Therefore, when the patient has a blood sedimentation rate of 40mm per hour, he or she should consult a doctor in a timely manner to identify the specific cause of the disease according to the actual situation through a professional doctor’s examination and choose targeted treatment under the guidance of the physician.