Chris Brown has been in and out of the news constantly following the 2009 incident when he assaulted his then-girlfriend, pop star Rihanna. The R&B singer has been involved in several violent incidents and disputes since that day, but new reports say there may be a medical explanation for his behavior.

According to Los Angeles court documents, Chris Brown has been diagnosed with several conditions, including bipolar II disorder, post-traumatic stress disorder, insomnia and substance abuse.

The Daily News obtained a letter from Chris Brown's rehab center elaborating on his circumstances:

"Our clinical team believes Mr. Brown became aggressive and acted out physically due to his untreated mental health disorder, severe sleep deprivation, inappropriate self-medicating and PTSD," it read.

Chris Brown checked into an anger management rehabilitation center following a misdemeanor assault charge in Washington, D.C. last October. Chris Brown and his bodyguard allegedly struck a 20-year-old art student in the face outside of the W Hotel. The assault violated his five-year parole from the Rihanna case.

More controversy followed after Chris Brown reportedly threw a rock through his mother's car window, shortly after enrolling in rehab.

Chris Brown has made improvements since that day, attending numerous therapy sessions a week, passing drug tests and attending early morning court-ordered community labor sessions.

"The judge is pleased and so are we with his progress, and we hope it continues," said Brown's lawyer Mark Geragos to The Daily News, following a hearing on Friday. "Chris is healthy and is doing very well. He's spectacular."

However, the judge was not satisfied enough to let Chris Brown leave rehab. The judge ordered Brown to stay in the facility until his assault trial in Washington two months from now. Once that trial is finished, the judge will revisit Brown's case and determine if jail time is necessary or not.