Kidney 3mm calcification usually requires no special treatment, but attention should be paid to finding the cause of calcification, which is calcium salt deposition that occurs in the kidney parenchyma. Renal calcification can usually be detected by imaging, such as when doing ultrasound or CT, the kidneys can be seen as a high-density shadow, presenting the appearance of calcified foci. The common causes of renal calcification include calcium salt deposition in the kidney, kidney stones, kidney tuberculosis, kidney tumor, etc. Most of the renal calcification does not have any symptoms, usually can not disappear by itself, no obvious effect on the body, no need for special treatment; if the calcification foci are relatively large, causing compression symptoms, especially compression of large blood vessels, which leads to renal hypertension, or the appearance of its related symptoms of lumbago, this time, we need to carry out symptomatic treatment. It is suggested that patients with renal calcification should go to the hospital and complete the examination under the doctor’s guidance. If the renal function is normal, no special treatment is usually needed, but regular follow-up observation is required.