Common complications of anticoagulation therapy include thromboembolism, bleeding, electrolyte metabolism disorders, etc.; the causes include over- or under-dosing and failure to rationalize the use of medication. 1. Thromboembolism: when there is a tendency to bleed, insufficient anticoagulation therapy will lead to poor therapeutic effect, which in turn will trigger the flow of blood, leading to the dislodgement of embolus, and ultimately lead to the formation of thromboembolism. 2. Bleeding: when the dose of drugs in anticoagulation therapy is too large, the effect of antiplatelet coagulation will increase, which will result in less platelet aggregation at the lesion site, leading to the formation of bleeding. 3. Electrolyte metabolism disorders: for patients with long-term use or irrational use of anticoagulation therapy, the drugs will cause an imbalance of electrolytes such as sodium ions, calcium ions and potassium ions, which will lead to electrolyte metabolism disorders. For drug treatment, it is recommended to strictly follow the doctor’s instructions for medication, and regular review, in order to better assess the condition and adjust the drug treatment.