Sources tell TMZ that Britney's doctors have two operating theories -- either that she suffers from post-partum depression or bipolar disorder. The doctors strongly believe post-partum is the problem.
As for substance abuse, as one source says, "No doubt about it - she likes to drink." But doctors believe the drinking is a way Spears has coped with a bigger problem.
We're told Britney, who is sticking it out at the Promises rehab facility in Malibu, is currently reading Brooke Shields' book, "Down Came the Rain," in which Shields reveals her battle with post-partum depression.
We're told doctors believe Spears' problem is complicated by an intense feeling on her part that she has lost control of her life.
Well it makes sense. Some of the things that increase the risk are:
• **History of depression or substance abuse
• Family history of mental illness• **Little support from family and friends• Anxiety about the fetus• Problems with previous pregnancy or birth• Marital or financial problems• Young age (of mother)
Britney has a least four of the seven things in her life that increase the risk. Plus it is one of the most common pregnancy complications. She really couldnt help being crazy. Hopefully she will make a full recovery and huge comeback!!
Sources: TMZ, Womens Health