Frederick M. Brown/Getty Images
The mystery behind Chris Brown's aggressive behavior may have just been solved.
According to legal documents obtained by E! News, the famous singer is believed to be suffering from bipolar disorder and post-traumatic stress disorder.
The letter from the rehab facility states, "Mr. Brown will also require close supervision by his treating physician in order to ensure his bipolar mental health condition remains stable. It is not uncommon for patients with Post Traumatic Stress Disorder and Bipolar II to use substances to self-medicate their biomedical mood swings and trauma triggers."
It continues, "Mr. Brown became aggressive and acted out physically due to his untreated mental health disorder, severe sleep deprivation, inappropriate self-medicating and untreated PTSD."