Brandon Marshall, who seemed to be just another example of pro athletes with off the field issues, recently revealed he was diagnosed with Borderline Personality Disorder , or BPD. Besides explaining some of his actions, the revelation means a lot more - to him and to others, especially those with BPD or other disorders. Per the National Institute of Health , BPD is a serious mental illness characterized by pervasive instability in moods, interpersonal relationships, self-image, and behavior. This does go to explain some of Marshall's issues which I won't get into here but a symptom is that their 'interests and values may change rapidly' and one of his instances definitly falls into the symptom of 'frequent displays of inappropriate anger'. When you are in the spotlight of pro sports and have the resources of a pro athlete with all the people coming at you for various things, I can see how this could quickly escalate into the problems many pros have.