Renal cell carcinoma, also known as renal adenocarcinoma, or renal cancer, originates from the urinary tubular epithelium. Kidney cancer accounts for 80%-90% of adult malignant tumors, and is the most common kidney tumor in adults. The ratio of male to female is about 2:1, and it can be seen in all age groups, with a high incidence at the age of 50-70 years, and occasionally at the age of 30 years or less, and individually at the age of 20 years or less. In terms of incidence rate, it is higher in developed countries than in developing countries, and higher in urban than in rural areas. The causes of kidney cancer are unknown and may be related to genetics, smoking, obesity and hypertension, etc. Coffee may increase the risk of kidney cancer. Coffee may increase the risk of kidney cancer. Kidney cancer also has a tendency to develop in families. When kidney cancer gradually grows and invades the renal pelvis, hematuria appears, which will attract the attention of patients. If it penetrates the perinephric membrane, it may invade the perirenal fat or even adjacent organs. Kidney cancer >3cm is prone to metastasis. With the popularization of medical checkups, more and more early kidney cancers have been diagnosed in time. Not smoking and avoiding obesity are important methods to prevent the occurrence of kidney cancer.