A study published in the Journal of Occupational and Organizational Psychology says yes. Dr. Nikos Bozionelos of the University of Sheffield in England researched personality and career success and found that white-collar workers who were the most agreeable, conscientious and sensitive to the needs of others were less likely to be promoted.....

Author and executive coach Dr. Lois Frankel says there are a number of ways nice people undermine themselves. Here are five of the most common, along with tips for (pleasantly) breaking the cycle:

1. You Let Others' Mistakes Inconvenience You
Before rearranging your life to correct someone else's mistake, assess the risk versus the reward of meeting unreasonable expectations. At times you'll have no choice but to jump in to put out the fire. But there will also be times when you have the latitude to push back and say, "This isn't what we originally discussed and agreed to. Since I'll have to rethink the plan and put more time into it than anticipated, I won't be able to have it completed by the initially proposed deadline." Let the person know you want to provide the best service possible -- and ask for the time and resources needed.

2. You Let Others Take Credit For Your Ideas
Ever suggest an idea that seemed to fall flat, only to find out later it was implemented and someone else got the credit? To avoid having others steal your ideas, make sure you state them loudly and confidently or put them in writing. If you're at a meeting and someone proposes the same thing you've previously suggested, call attention to it by saying, "Sounds like you're building on my original suggestion, and I would certainly support that."

3. You Apologize Unnecessarily Save your apologies for big-time bloopers. When you do make a mistake worth apologizing for, apologize only once, then move into problem-solving mode. Objectively assess what went wrong and ways to fix it. Always begin from a place of equality, for example: "Based on the information initially provided to me, I had no idea that was your expectation. Tell me more about what you had in mind and I'll make the necessary revisions."

4. You Work Without Breaks
Use your vacation days; take your lunch. Working non-stop can make you appear flustered, inefficient and incompetent. It also makes you less productive. To maintain maximum levels of concentration and accuracy, experts suggest you take a break every 90 minutes.

5. You Do Others' Work For Them
Recognize when people delegate inappropriately to you and avoid the inclination to solve everyone's problems for them. Practice saying unapologetically, "I'd love to help you out with this, but I'm swamped." Then stop talking. Of course being nice is not all bad. Dr. Bozionelos points out that it can be of great advantage as long as you are aware of and able to adjust your natural tendencies to undervalue yourself and compromise your personal interests. As Dr. Frankel puts it, "When all is said and done, do you really want written on your tombstone: "She Always Put the Needs of the Company Ahead of Her Own?"

Kate Lorenz is the article and advice editor for CareerBuilder.com. She researches and writes about job search strategy, career management, hiring trends and workplace issues. Other writers contributed to this article.