Since Britney Spears has spent more than 24 hours in rehab, doctors have been able to work with her and try to discover the cause of her erratic behavior.
According to TMZ.com, doctors at the Promises treatment center believe Spears is suffering from post-partum depression or bipolar disorder.
Since the singer has given birth twice in two years, doctors are leaning towards post-partum depression as the reason behind her shaved head and excessive partying.
While many sources, including her ex-husband Jason Alexander, have been quick to accuse Spears of drug abuse, they have forgotten about the legitimate hormonal imbalance that can affect mothers.
Doctors at the Malibu rehab hospital told TMZ that Spears' excessive partying and drinking could have been her way of coping with depression, rather than an isolated problem.
Now that the mother of two has been in Promises for almost a week, she has settled in for her possible six week stay.
Reports have claimed that the former pop princess has rented out an entire wing at the lavish grounds, in an effort to have privacy and get her life back on track without fear that other patients will blab to the media.
A source told Britain's The Sun newspaper, "She wants all the rooms on her wing. It will cost her hundreds of thousands (of dollars)."
TMZ adds that Spears is reading "Down Came The Rain," the self-help book about post-partum depression written by Brooke Shields.
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