Cancer is a disease that often develops silently, making it crucial to pay attention to subtle changes in your body. While not every symptom means you have cancer, some early signs should never be ignored. Recognizing these changes early can significantly improve the chances of successful treatment and recovery. Here are five warning signs that may indicate cancer is developing in your body.

1. Unexplained Weight Loss: Losing weight without changing your diet or exercise routine could be a sign of an underlying health issue, including cancer. Sudden weight loss of 10 pounds or more, especially when it happens without trying, may signal cancers such as those of the stomach, pancreas, esophagus, or lungs. If you notice a drop in weight with no clear reason, it’s important to speak with a healthcare provider.

2. Persistent Fatigue: Feeling constantly tired, even after plenty of rest, may be more than just stress or aging. Fatigue is a common early symptom of leukemia and can also occur with colon or stomach cancers. This kind of fatigue feels different—more like exhaustion that doesn’t go away with sleep or relaxation. If you’re experiencing ongoing fatigue with no clear cause, consider getting it checked.

3. Unusual Lumps, Bleeding, or Pain: New lumps or masses, especially in the breast, testicles, or lymph nodes, should be evaluated. Unexplained bleeding—such as blood in the stool, urine, or from the vagina outside of normal cycles—can be a red flag. Persistent pain in one area, like a headache or back pain, may also signal certain types of cancer. Any unusual or lasting symptoms like these should be discussed with a doctor promptly.