Minor differences in blood pressure readings between the arms generally do not pose a health issue. However, a difference of more than 20 mmHg for systolic pressure or more than 10 mmHg for diastolic pressure could indicate an underlying health problem, such as stenosis in the main artery leading to the arm with the lower pressure. In the case of a significant difference in blood pressure readings between the arms, it is advised to consult a doctor, as a recurrent difference of about 10 to 15 mmHg for systolic pressure may indicate a risk of atherosclerosis, increasing the risk of cardiovascular diseases and other complications in the future.
A doctor may measure blood pressure in both arms to check for hypertension. If blood pressure is higher in one arm, the doctor may use that reading to monitor blood pressure, which is more accurate and better for your health care. A significant difference in blood pressure measurements between the arms may signal a health issue, such as:
- Atherosclerosis of the arms (Peripheral artery disease).
- Kidney disease.
- Diabetes.
- Heart disease.
- Congenital stenosis in the aorta or major arteries.
If the doctor notices a significant difference in pressure readings between the arms, they may also measure blood pressure in the lower extremities to ensure there is no difference between blood pressure in the arm and blood pressure in the leg, as this could indicate congenital stenosis of the aorta (coarctation of the aorta). This issue can lead to high blood pressure in children and young adults and may be treated through catheterization or surgery.
