Generally speaking, the decrease of thromboelastography R value suggests that the activity of the body’s coagulation factors is enhanced, and the common causes can be categorized into congenital and acquired factors. 1. Congenital factors: patients with congenital coagulation dysfunction may show reduced R value of thromboelastography in laboratory examination, which is common in patients with thrombophilia. 2. Acquired factors: Due to various chronic diseases, patients who have been bedridden for a long time are in hypercoagulable state, and the R value will be reduced; malignant tumors, thrombophilic diseases, infectious diseases and other factors can cause the body to be in a hypercoagulable state, and thus the R value of thromboelastography will be shown to be reduced. People with decreased R value of thromboelastography need to consult a doctor in time and use anticoagulant drugs, such as low molecular heparin calcium, warfarin, etc. under the doctor’s guidance if necessary, so as to avoid the formation of thrombus which may cause serious consequences.