How do you come to the conclusion that mental health issues around sickness identity is a smaller problem than underdiagnosed (physical) diseases? Could you poi

How do you come to the conclusion that mental health issues around sickness identity is a smaller problem than underdiagnosed (physical) diseases? Could you point to some statistics? Personally I do not know many people who were told of being depressed which were later diagnosed with a physical disease. Could you please give some examples?