Third, kidney disease, when there is nephritis or kidney tumor, in the early stage can also appear symptoms of lumbar acidity, can have hematuria and proteinuria, then we should carry out kidney CT, ultrasound, imaging and urine tests for diagnosis; fourth, kidney deficiency, kidney deficiency can also appear lumbar acidity, often accompanied by weakness of the knees, then we should carry out Chinese medicine pulse Diagnosis, if necessary, the treatment of kidney supplementation.