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Why are many cancers found in the middle and late stages?

Male  31 years old 2018-06-29
A few days ago, my colleague was diagnosed with advanced lung cancer. Why are most of the tumor diseases as long as they are discovered?

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  • BY Mamie Doris 2018-06-29
    In fact, many diseases in the human body (such as tumors, Alzheimer's disease, etc.) often have undetectable pathological and metabolic changes in some tissues and organs, and then gradually develop into substantial lesions, and then obvious clinical symptoms appear. By the time clinicians can make a definite diagnosis, these conditions may have progressed to middle to late stages.
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