Because whole sections of your hub about diabetes is recorded word for word on a number of other sites including blackdoctor.org which I presume to be yours.
Just copy the first paragraph of your hub and enter it into Google search and you will see the other sites where exactly the same words are used.
When you wrote the hub you will have seen the 'continue' page. On this page it says that Hubpages is for unique content - even if it is your own.
You will need to rewrite your article before it is seen as not duplicated material.