Lindsay Lohan -- Victim of Bad Diagnosis

TMZ has learned ... the doctors who have evaluated Lindsay Lohan at UCLA have concluded she does not suffer from the drug or psychiatric problems that were previously diagnosed.



Sources familiar with Lindsay's treatment at UCLA tell TMZ ... there's a feeling among doctors that Judge Marsha Revel "overreacted" when she ordered Lindsay to stay at the facility for 90 days.

We're told Lindsay has been "weaned off" all of her meds -- Dilaudid, Ambien, Adderall, Zoloft, Trazodone and Nexium -- and has had no adverse reaction.  Likewise, she has had no withdrawal issues in the alcohol department.  Bottom line -- the docs don't think Lindsay is an addict.

And, we're told Lindsay was misdiagnosed in the past with Attention Deficit Hyperactivity Disorder (ADHD) -- which is why she started taking Adderall.  The UCLA docs say LiLo does not have ADHD.

And finally, as for having psychiatric problems -- again the doctors say it's just not the case.  Morningside Recovery -- the rehab facility Judge Revel initially chose for Lindsay -- determined she was bipolar, but the docs at UCLA say she is not.  Our sources say Lindsay suffers from a personality disorder, which is all too common in society and sometimes partly the result of difficulties when growing up in Hollywood.

Our sources say the doctors are recommending an early release from UCLA -- we're told they think the maximum amount of time she should spend there is 30 days -- followed by outpatient care.