Kidney cancer has an obvious incidence characteristic, the incidence rate is two to three times higher than that of women. In addition to physiological reasons, the high incidence of kidney cancer in men has a lot to do with men’s smoking, excessive socializing and stressful life. Some studies show that the risk of kidney cancer in smokers is twice as high as that in non-smokers, and the longer the smoking time and the higher the smoking volume, the higher the risk, which is related to the chronic stimulation of the organism by many toxic substances in tobacco. In addition, men have more social functions due to their work, and long-term high-fat and high-calorie diet will not only lead to obesity and high blood pressure, but also increase the chance of kidney cancer. Therefore, quitting smoking, reducing high-fat and high-calorie foods such as large fish and fried foods, and actively controlling weight can help prevent kidney cancer. Ultrasound is one of the most appropriate methods to screen for kidney cancer and can detect kidney tumors with a diameter of 0.8 cm. If ultrasound finds abnormalities, CT examination should be performed, which can detect tumors of 0.5 cm or more, and CT or MRI should also be performed if the diagnosis still cannot be confirmed. For early detection of kidney cancer, men over 40 should insist on annual kidney ultrasound examination, especially for those who have poor lifestyle and family history of kidney cancer. Clinically, 50% of early asymptomatic kidney cancer patients are detected through physical examination. If patients show three typical symptoms of kidney cancer, namely, back pain, hematuria and mass, it means that the disease has developed to the middle and late stage. Their back pain is persistent and dull, and can be severe if the tumor invades the nerve or lumbar spine. If the tumor invades the nerve or lumbar vertebrae, it may cause severe pain. When the hematuria coagulates into a cord-like blood clot in the ureter, it may also cause back pain. In addition, kidney cancer can also cause fever, anemia, wasting, abnormal liver function, etc. Unfortunately, there are no obvious symptoms in the early stage of kidney cancer, so it is more important to emphasize the importance of early medical examination.