Detecting kidney cancer, also known as renal cancer, can be challenging, but it is not impossible. It is important to know about the myriad signs and symptoms associated with kidney cancer to increase awareness and ensure early diagnosis. By understanding these indicators and their potential causes, one can take proactive steps to protect their health. It is also vital to understand the importance of regular checkups to avoid any scares. 19 warning signs of kidney cancer Hematuria: Blood in the urine Hematuria, characterized by blood in the urine, is a hallmark symptom of kidney cancer. The presence of blood in the urine can range from a faint pink tinge to a more noticeable red or brown hue, making it an alarming sign for many. Although hematuria can also signal less severe conditions like urinary tract infections or kidney stones, it should always be investigated by a healthcare professional. Pain or discomfort in the side or back Persistent pain or discomfort in the side or lower back without any injury is a common symptom of kidney cancer. This sensation varies from a dull, nagging ache to sharp, intermittent pain. It emerges as the tumor enlarges and exerts pressure on surrounding nerves or organs.