There is no most common way to diagnose kidney cancer. The more common tests for kidney cancer diagnosis are physical examination, including ultrasound, CT, MRI, etc., and ultimately pathological examination is needed to confirm the diagnosis. Generally kidney cancer is found during physical examination, because there are no symptoms in the early stage of kidney cancer. If there are symptoms of hematuria, pain as well as lumps, they are often kidney cancer in late stage. 1. Ultrasound: it can find the occupancy of 1 centimeter or even less than 1 centimeter, if the occupancy is found, further examination, such as CT or MRI, is needed. 2. CT: it can find lesions as small as 5 mm in the kidney, and also show the invasion relationship between the tumor and other tissues. MRI is more accurate than CT and can determine the metastasis of the tumor through lymph nodes. 3. Pathological examination: However, the final diagnosis needs to be confirmed by pathological examination. Pathological examination is an important examination means to confirm the diagnosis of renal cancer, which can do a puncture of renal occupancy to determine whether the occupying tissues are cancerous tissues or not. After the above examination, it is usually possible to determine whether there is kidney cancer or not. If it is determined that the occupying tissue is cancerous, it is suggested that patients should go to regular hospitals for consultation and treatment in time to avoid the deterioration of the condition.