Kidney cancer is often referred to as a "silent disease" because it tends to develop slowly and without obvious symptoms in its early stages. Many people may not realize anything is wrong until the cancer has progressed significantly. That’s why being aware of the subtle signs can be life-saving.

Here are some of the most commonly overlooked symptoms of kidney cancer:

1. Blood in the Urine (Hematuria)

This is one of the earliest and most common symptoms. The urine may appear pink, red, or brownish. Even if it happens once and disappears, it should never be ignored.

2. Persistent Lower Back Pain

Pain in the back or side that doesn’t go away and isn’t related to injury may be a red flag. This discomfort typically occurs below the ribs and may feel like a dull ache or sharp stab.

3. Unexplained Weight Loss

If you're losing weight rapidly without any change in diet or activity level, it could indicate several health concerns, including kidney cancer.

4. Fatigue

Feeling constantly tired, even after adequate rest, is a common but non-specific symptom of many types of cancer, including kidney cancer.

5. Fever That Comes and Goes

Recurrent fevers without an obvious cause—like an infection—may point to internal inflammation or an underlying malignancy.

6. Lump or Mass in the Abdomen

In some cases, a hard lump or swelling in the abdomen may be noticeable. This is a more advanced symptom but is often still missed.

7. Anemia

Kidney cancer can affect red blood cell production, leading to anemia. If you feel weak, short of breath, or lightheaded, a blood test could reveal underlying issues.