Weight loss for no known reason, not through stress or change in diet or exercise is called unexplained weight loss. It is a common sign in the early stages of some types of cancer. 60% of people with lung cancer and 80% of people with stomach, pancreatic or esophageal cancer have lost a significant amount of weight by the time they are diagnosed. Although it is often characterized by loss of appetite, some people in the early stages of cancer may still be eating normally and yet still lose weight. If you are not dieting and you lose more than 5% of your normal weight in 1 month, or 10% in 6 months, you should ask your doctor to investigate as this can be the first sign of cancer.
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