Left and right hand blood pressure is not the same may be thrombus, there may be physiological reasons, atherosclerosis, aortitis, etc., the specific causes should be further examination. 1. Thrombosis: If the examination finds that the patient has no other primary disease, and repeated long-term blood pressure difference between the right and left hands, suggesting that the patient’s arm arteries and veins in the presence of thrombosis. 2. Physiological reasons: Healthy people’s right and left hand blood pressure differences also exist, is a normal physiological phenomenon. Due to the different origins of the subclavian artery, the difference between the blood pressure of the left and right hands is often 5~10mmhg. 3. Arteriosclerosis: As a result of arteriosclerosis and subclavian artery blood-stealing syndrome, in addition to dizziness and other cerebral ischemia symptoms, the blood pressure of the left and right hands may also be different. 4. Aortitis: If the patient has numbness and pain in one side of the upper limb, it suggests that the patient has aortitis, and at this time, due to the inflammation of the patient’s left and right hand blood pressure is not the same. If the left and right hand blood pressure is not the same, it is recommended to go to the regular hospital for a systematic examination to clarify the cause of the disease, to prevent delays in the patient’s condition.