A high percentage of monocytes is not dangerous in itself, but is often indicative of a disease, and the risk is mainly due to the primary disease. 1. The normal value of monocyte percentage is less than 8%, if it exceeds 8%, it is considered high, if there is no obvious discomfort, it is generally not dangerous, and can be reviewed regularly. 2. If the percentage is more than 10%, and accompanied by physical discomfort, there may be inflammation and bacterial infection risk, such as tuberculosis, typhoid fever, infective endocarditis and so on can cause monocytes increased significantly. This is a reaction of the human organism to fight infection, and when the infection is controlled, the monocytes can return to normal. 3. If infection is ruled out, a possible risk of hematologic disease needs to be considered. If the high monocyte percentage is accompanied by uncomfortable symptoms or gradually worsening, you should go to the hospital in time, and the doctor will determine the cause of the high monocyte percentage according to the symptoms, signs and auxiliary examination, and provide timely treatment.