Early symptoms may include hematuria, which is often painless, intermittent, and visible throughout. Hematuria caused by renal cancer is often due to blood clots blocking the fallopian tubes, and the clots can form stripes through the ureter. Secondly, back pain may occur, which is another common symptom of kidney cancer. It is mostly dull pain felt in the back and may be caused by the growth of the tumor. Thirdly, a mass may appear, which can be felt in the abdomen during a medical examination. Generally, feeling a mass in the abdomen is possibly a symptom of the advanced stage.