At one time or another during the course of your career, your inner voice will demand, "Quit! This is just not worth it!" But you keep telling yourself that it will be too hard to find a replacement for you, you have friends you like working with, you have only a few more years before you retire, hopefully things will get better soon, or you can't find another job that pays even close to what you are making now.

In all actuality, you're not doing anyone -- yourself, your company, or your customers -- any favors by staying at a job that you know in your heart isn't the right fit anymore.

Here are 7 warning signs that it's time to start looking for your next job.

1. You can't stand your job.

You dread going into work, and when Mondays roll around you have to create hourly rewards for the day just to motivate yourself to walk out the front door. You consider calling in sick for the slightest thing--you cut yourself shaving, your stomach hurts, whatever. You get the idea--you really dislike your job!

2. Your company just isn't what it used to be.

When you began with the company, it was the place to be. You were excited about working there and others envied you. Now years have gone by and the company has changed -- maybe it's gone in a different direction or there's new management. Long story short, it has lost its edge--and your excitement along with it.

3. You're working way too much.

Every year you find you're doing more and more to stay above water. You feel like you're drowning at times, even though you're working 40-plus hours a week and on the weekends.

4. You're being neglected.

You have been working hard and providing measurably positive results for your company, yet your pay isn't what it should be or you keep getting skipped over for a promotion or new opportunities to grow.

5. The boss from hell just got hired.

New management has been hired, and you feel he or she will either destroy the company or drive you crazy. The new boss just doesn't understand the company's vision or the employees who work there--actually he or she just doesn't seem to care--and after several months there appears to be little hope of that ever changing.

6. You're bored.

Are you bored at work? Can't find the passion and drive you used to have when you first started working there? At your desk, do you find yourself surfing the Web more often or searching the job listings religiously?

7. You're no longer playing nice.

Sometimes the office dynamics change with a few new hires. All of a sudden, you find yourself arguing on a daily basis with your co-workers and feeling as if you're being scrutinized at every turn.