Regardless of the size of kidney cancer, about 20% of patients may have no symptoms in the early stage, and are only found to have occupying lesions in their kidneys or palpable abdominal masses during screening and physical examination or ultrasound for other reasons. Some patients with small primary cancer foci in the kidney and no urinary tract or intrarenal symptoms may first show symptoms of distant metastatic cancer. For example, if patients are found to have axillary or abdominal masses, they are only found to be kidney cancer in order to find the primary lesion. Because of these characteristics, the early signs of kidney cancer can be manifested in two aspects: symptoms outside the urinary tract and intrarenal symptoms: I. Symptoms outside the urinary tract 40% of the patients only show general symptoms, such as weakness, lack of energy, poor appetite, indigestion, nausea, constipation, etc. About 50% to 75% of patients show symptoms other than general urological symptoms, such as fever, emaciation, anemia, liver dysfunction, gastrointestinal dysfunction, hypertension, hypoglycemia, etc. These symptoms often appear earlier than urological symptoms, for example, fever can appear 2 to 6 months earlier than hematuria. Therefore, as the early warning signs of kidney cancer, all patients with these symptoms should not forget to check the urinary tract, and don’t forget that kidney cancer can also have symptoms outside the urinary tract. Intrarenal symptoms Kidney cancer has three major symptoms: hematuria, pain and lumps. If all three symptoms are complete, the disease process is mostly advanced; generally in the earlier stage, only one or two of them are present. The three symptoms are as follows: 1. Hematuria is mostly sudden hematuria with no pain or other symptoms. About 70% of kidney cancer patients will have hematuria. This kind of hematuria is often intermittent and can stop on its own, but it will recur many times. If you can draw attention to it at the first time of hematuria and seek medical attention early, you can get early diagnosis. 2.Lower back pain About 50% of patients will have lower back pain. It is the result of the enlargement of cancer foci pulling the kidney peritoneum or compressing the surrounding nerves and muscle tissues. It is mostly a dull pain in the lower back or upper abdomen. Occasionally, blood clots may be discharged downward and cause severe colic, which may be mistaken for kidney and ureteral stones. 3.lump in the waist Kidney cancer lesion can be felt (or seen) from the waist or upper abdomen when it has increased to a considerable extent. About 20% to 30% of patients will have this symptom. The mass is easier to be felt when lying on the side, and sometimes it can be seen to move up and down with breathing. If the mass adheres to the surrounding tissues, the mass will be fixed and cannot be pushed, then it is in advanced stage. The early warning signs of kidney cancer mentioned above appear to be various and mostly general symptoms, and urinary symptoms will not appear until the disease has progressed to a certain degree. Therefore, early detection and diagnosis of kidney cancer depends on people’s high alertness to this cancer. All men and women over 40 years old should not forget to include urinary tract examination when the above mentioned warning signs appear in order to rule out the possibility of kidney cancer. Kidney cancer is the most common malignant tumor of kidney, accounting for about 75% of kidney tumors. Kidney cancer mostly occurs in the age of 40-60 years old and is rare in children; the ratio of male to female is 2 or 5:1. Kidney cancer can occur in any part of the kidney, mostly in the kidney, and often grows singly with different growth rate and mass size. Another characteristic of kidney cancer is that it is prone to distant metastasis. The common sites of distant metastasis include lung, liver, bone, chest, abdomen, pelvis, perineum and soft tissues of limbs.