I agree. In my experience as well, it was best to be open, although with the desk job that I have I was able to gauge what I told them and what I didn't tell them. (if that makes sense.) That way you are honest, but not sharing too much.
Really it is up to you, but I like not having to hide my issues (e.g when a coworker walks by my office and the lights are out, they know I am having a headache day.)
Best of luck to you , and keep us posted
!