On the surface, focusing on your career doesn’t sound like a bad thing. That being said, it all depends on how you are focusing on it. If you are working hard and loving what you do, that is one thing. If you are becoming agitated, stressed and are focusing on the wrong things, you may need to take a step back.
When you think about nothing but your career, for the right or wrong reasons, it can have a negative impact. You need to make sure you are taking the time to relax and unwind, having a break from work and doing other things you enjoy.
You may also be throwing yourself headfirst into a job in order to try and enjoy it. If you are not enjoying it the way you should be, think about making a career change. Look for a job that excites you and where you will have a better work-life balance.