Can a complete blood count detect cancer?

Blood routine tests cannot be directly used to diagnose cancer, but they can serve as one of the辅助 methods for cancer screening. If concerned, it is recommended to seek medical advice early. The specific analysis is as follows:

A blood routine test primarily examines key components in the blood such as red blood cells, white blood cells, and neutrophils, helping assess whether a person's blood cells are normal and whether there are signs of infection or blood-related disorders. Although certain cancers may indirectly affect some indicators in a blood routine test, these changes are not specific and therefore cannot serve as a definitive basis for cancer diagnosis.

For example, specific cancers such as gastric cancer and colorectal cancer may lead to chronic blood loss, causing anemia. Hematologic malignancies like leukemia and lymphoma may present as abnormally high or low white blood cell counts. Therefore, persistent anemia, abnormal platelet levels, or unusual white blood cell counts detected in a blood routine test may indirectly suggest the possibility of cancer.

In daily life, it is important to maintain a healthy lifestyle, improve dietary habits, adhere to regular作息 patterns, strengthen physical health, and reduce the risk of disease.