The answer here reflects the importance of a solid foundation of good communication. Bipolar Disorder can and likely will create intermittent stresses in your personal and work relationships. In your personal relationships others will need to understand what's happening with you in order to provide adequate support. They will also need to learn not to interpret your mood variability as indicative of something amiss within the relationship. This isn't easy nor does it apply to casual acquaintances, but within your close relationships, mutual understanding of how your mood variability impacts your day-to-day interactions is a critical piece that requires ongoing communication.
In work settings the norms and expectations around self-disclosure are less ideal. Openness and honesty in the workplace are typically not the same as we find within our personal relationships. For some, there are exceptions to workplace norms and you're very fortunate if your work setting is among them.
That said, if you've got a good relationship with your boss or supervisor, then discussion of matters related to your mood disorder can be very helpful. When such is possible then you may find there's some flexibility and acceptance when work performance is adversely affected by bipolar symptoms.
Realistically speaking, we can agree that all work sites don't reflect a high tolerance for the impact of psychiatric disorders upon work performance. But, if you are fortunate enough to find yourself in a high tolerance work setting then it's self-evident that open communication about your disorder could greatly lessen employment-related stress levels.