Why is my Girlfriend Always Angry?

This question has come up a lot. Probably because there are a lot of angry girlfriends out there. Is she always yelling at you? Cursing, complaining, bitching, nagging, exploding. Are you both at your wits end?
The so-called experts also have a lot of remedies for you, and many of them are conflicting. How do you know what's right and what is bad advice? The answer is that it depends on the source of your girlfriend's anger, and her ability to modulate her emotions.