June 1, 2015 8 min read

Opinions expressed by Entrepreneur contributors are their own.

You can’t build a strong professional network if you don’t open up to your colleagues; but doing so is tricky, because revealing the wrong things can have a devastating effect on your career.

Sharing the right aspects of yourself in the right ways is an art form. Disclosures that feel like relationship builders in the moment can wind up as obvious no-nos with hindsight.

The trick is to catch yourself before you cross that line, because once you share something, there is no going back.

TalentSmart has tested more than a million people and found that the upper echelons of top performance are filled with people who are high in emotional intelligence (90% of top performers, to be exact). Emotionally intelligent people are adept at reading others, and this shows them what they should and shouldn’t reveal about themselves at work.

Related: How Successful People Work Less and Get More Done

The following list contains the 12 most common things people reveal that send their careers careening in the wrong direction.