So for the last couple of weeks or so I've been seeing a psychologist, and last session she said that she thought my problems are "subclinical", and I'm having a hard time understanding what that actually means?

 Because as far as I can tell that's completely incorrect and I want to know if I'm not expressing my problems to her clearly enough or (and I hope it's not this) that she isn't taking me seriously. I really don't want to believe the latter but from everything I've told her and from my current understanding of "subclinical", that's just not correct at all.

So basically my question is "what are subclinical mental health issues?" or something similar.
Thank you in advance.