Elevated D-dimer in pregnant women may be caused by physiological or pathological factors, and needs to be treated according to the specific cause. 1. Physiological factors: after pregnancy, most pregnant women will have increased D-dimer because their blood is in a state of high coagulation. If the increase in D-dimer is not obvious and there are no uncomfortable symptoms, it is generally considered to be caused by physiological factors and does not require special treatment, but continuous observation. 2. Pathological factors: If the increase of D-dimer is obvious, combined with pre-eclampsia and fetal growth restriction, or combined with immune diseases, such as antiphospholipid antibody syndrome. Combination of high risk factors for thrombosis, such as obesity and post cesarean section, need to be treated with salicylic acid drugs, such as aspirin to inhibit platelet function, the use of coagulants, such as low molecular heparin for anticoagulation, etc. The above drugs have certain risks. The application of the above drugs carries certain risks, and patients need to be guided by a specialist.