The right kidney is small to understand whether the size of both kidneys differs by more than 1.5 cm in diameter. If the above situation occurs, we can consider vascular stenosis kidney damage, hypertensive kidney disease, etc. We can perform renal artery ultrasound to clarify the cause, and if necessary, we can perform stenting of the stenosed renal artery. Some patients can be combined with malignant hypertension, and the hypertension can be restored to normal through the above treatment. If both kidneys are shrunken, and the right kidney is smaller, the possibility of hypertensive kidney damage is considered to be high, it is recommended to actively protect the kidneys with calcium antagonists such as amlodipine, and at the same time apply renal health, Jin Shui Bao, Bai Ling capsule, medicinal charcoal, compound alpha-keto acid and other drugs to actively protect the kidneys. Generally the kidney shrinkage will not increase in size again, so be sure to review regularly.