Erm good question that had me thinking for a bit.

I like Christina's response.

For me, when I'm stable, I'm not really quick to anger. But during mania - oh dear all hell breaks loose. I can be somewhat irritable by nature. And by nature I'm not really a happy go lucky person unless I'm entering into an episode.

I would think that people with absolutely no diagnosis what so ever who experience anger perhaps didn't develop the right coping strategies to deal with emotions and how to process their feelings, if there is no chemical balance at all involved. Also, I've heard of the anger "iceberg". The anger is the 10% of the iceberg that you see floating above the sea. The 90% that you don't see that's under the sea is insecurity. And some can be quicker to anger than others. It depends on our threshold and what triggers us.

Someone with bipolar would have symptoms such as euphoria, depression etc jump up during episodes.

I don't think everyone else has ALL the issues you've listed without having something going on, diagnosed or not.

I was only diagnosed with bipolar aged 31 but I know I've had it all along - many years before diagnosis. I was only diagnosed with borderline personality disorder this year - at the age of 36 - but I trace evidence back to my early teens. So it was always there all along. Just undetected.