Yes, it is possible to have cancer for years and not know it. The reason for this is that cancer can develop slowly and may not cause any noticeable symptoms in its early stages. Some types of cancer, such as pancreatic cancer, can be difficult to detect until they have progressed to an advanced stage.


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In addition, some people may not experience any symptoms of cancer, or they may mistake their symptoms for other less serious conditions. For example, some common symptoms of cancer, such as fatigue, weight loss, and loss of appetite, can also be caused by other medical conditions.


Regular cancer screenings and check-ups are important for detecting cancer in its early stages, when it is more easily treatable. Depending on your age, sex, and other risk factors, your healthcare provider may recommend certain cancer screenings, such as mammograms, colonoscopies, or Pap tests.


It's also important to pay attention to any changes in your body and report any unusual symptoms to your healthcare provider. This can help to identify cancer or other medical conditions early on and increase the chances of successful treatment.


In summary, while it is possible to have cancer for years without knowing it, regular check-ups and cancer screenings, as well as paying attention to any changes in your body, can help to detect cancer in its early stages when it is more treatable.