The left kidney pain for more than a year, it is recommended to go to the hospital to improve the examination to clarify the cause of the disease, because there are many causes of left kidney pain. The first one is kidney cysts, patients may have lumbar discomfort or vague pain, when the size of the cysts increase after the pain may be aggravated, do the ultrasound of both kidneys can be found in the end there is no cysts. The second common cause is kidney stones, patients with kidney stones may have no symptoms, but when renal colic occurs, the pain may be severe, accompanied by nausea, vomiting. Thirdly, there may be occupancy of the kidneys, which may cause vague pain. There are benign and malignant occupancy of the kidneys, and it is necessary to perform CT of both kidneys to clarify what type of occupancy it is. Fourthly, chronic glomerulonephritis or chronic renal failure may also lead to vague pain in the kidneys. Fifthly, lumbar muscle strain or neurological disorders may also cause discomfort in the left kidney region.