Early stage of left kidney tumor usually has no obvious symptom manifestation, if the disease develops to middle or late stage or metastasis occurs, patients may have waist pain and abdominal mass, accompanied by hematuria and fever. Usually, early kidney tumor symptoms are not obvious, mostly manifested as painless hematuria, and some patients will have waist and back pain and body fatigue. When the disease develops to middle or late stage, patients will show obvious discomfort in low back, hematuria, lumbago, localized swelling, etc., accompanied by high blood pressure, high blood sugar and abdominal mass appearance. Patients with more severe disease may even experience acute abdominal pain and shock. Further imaging examination will find that there is obvious occupation of the kidney, and if the renal tumor has metastasized, paraneoplastic syndrome may occur, which is manifested as hypocalcemia, recurrent low-grade fever, and so on. Renal tumor examination is mainly judged by imaging examination, urinary CT and nuclear magnetic. Early renal tumor is not easy to be detected, and it is recommended that people with the above symptoms should go to the hospital for timely diagnosis and examination.