High plasma D-dimer may be the result of thrombotic disorders such as pulmonary embolism, intravascular thrombosis, acute myocardial infarction, or secondary to tumors, severe infections, and other diseases. 1. Plasma D-dimer is a product of secondary hyperfibrinolysis in the body, and its elevation suggests that the body is at increased risk of thrombotic disease. When pulmonary embolism occurs, D-dimer will often be significantly elevated, need to further improve the pulmonary arteriography and other tests to further clarify the diagnosis. 2. D-dimer may also be elevated in cases of intravascular thrombosis, acute myocardial infarction or cerebral infarction. 3. In addition, D-dimer elevation may also occur when severe infections (severe pneumonia, etc.) and solid tumors (lung cancer, intestinal cancer, etc.) occur in the body. It is recommended that patients with elevated D-dimer should consult a doctor in a timely manner, complete relevant examinations to clarify the specific cause of the disease, and then treat the cause of the disease.