Blood clots are usually not self-diagnosed, and usually require comprehensive analysis based on the patient’s underlying disease, clinical symptoms, auxiliary examinations, etc. It is recommended that patients should consult a doctor in a timely manner when they experience discomfort, improve relevant examinations, and be judged by the doctor. Patients with thrombus usually have underlying diseases of hypercoagulable or pre-thrombotic state, such as atherosclerosis, pregnancy, long-term use of contraceptives and so on. Clinical manifestations of thrombosis are related to the location of the lesion, such as deep vein thrombosis occurs in the lower limbs, patients may experience pain, swelling, muscle spasm and other symptoms; cerebrovascular thromboembolism manifested as intracranial hypertension, vomiting, headache, limb weakness and so on. Symptoms need to be combined with imaging examinations and test results, such as angiography, ultrasonography, CT, platelet measurement, coagulation tetrameter, etc., in order to make an accurate diagnosis. Patients are advised to make the diagnosis under the guidance of a doctor, and not to blindly make judgment on their own, so as not to affect their condition.