Early detection can make all the difference when it comes to cancer. While some symptoms might seem mild or unrelated, they could be early warning signs of something more serious. Being aware of subtle changes in your body and acting on them quickly can lead to earlier diagnosis and better outcomes.

Below are 5 key warning signs that may indicate cancer is developing in the body. While these symptoms don’t always mean cancer, they should not be ignored—especially if they persist or worsen over time.

1. Unexplained Weight Loss

If you’re losing weight without trying—especially more than 5 kilograms (about 10 pounds)—it could be a red flag. Sudden, unexplained weight loss can be linked to cancers of the pancreas, stomach, lungs, or esophagus. Cancer cells can change the way your body processes nutrients and calories, leading to rapid weight changes.

What to watch for:

You’re not dieting or exercising more, but still losing weight

Loss of appetite or feeling full quickly

2. Persistent Fatigue

This isn’t the usual tiredness from a busy day—cancer-related fatigue doesn’t get better with rest. It may be an early sign of leukemia or cancers of the colon or stomach, where internal bleeding can contribute to feeling constantly drained.