“過度診斷”是有具體醫學定義的：

Overdiagnosis is the diagnosis of a medical condition that would never have caused any symptoms or problems.

過度診斷的具體案例無法統計，隻能以別的角度來推測所占比例。

一旦診斷了冠以癌名，即使是grade 1，沒人會淡定，太難了。病人難，醫生也難。