Introduction Directed by James Mangold, Girl Interrupted is a thrilling movie about a sixteen-year-old Susanna Kaysen who suffers from borderline personality disorder. On April 1967, Susanna checks into Claymoore Hospital, a psychiatric hospital in Belmont, Massachusetts. In the hospital she finds other patients, befriends them and they make her stay there eventful. As the film opens up, Susanna tries to commit suicide; fortunately, she fails. Among the friends cum patients, that Susanna finds in this hospital is Daisy, Lisa Cody, Cynthia, Georgina, Lisa, and Polly. Apart from the dramatic and the entertaining aspect of this movie, it contains a psychological aspect and this is the major purpose of this paper; exploring the psychological disorders in the movie, giving their causes and treatment. As aforementioned, Susanna’s friends are patients in this hospital and each suffers from a different psychological disorder. Starting with Susanna, she suffers from borderline personality disorder; Lisa is a sociopath; Polly is schizophrenic; Georgina is depressed while Daisy suffers from obsessive-compulsive disorder. This paper explores four mental disorders viz. borderline personality disorder, Schizophrenia, obsessive compulsion disorder and major depressive disorder. Borderline Personality Disorder (BPD) BPD is a “prolonged disturbance of personality function in a person (generally over the age of eighteen years, although it is also found in adolescents), characterized by depth and variability of moods” (Millon, 1996, p. 645). Symptoms of BPD include, mood swings, poor interpersonal relationships, low self-esteem, and in severe cases, it leads to disassociation. Consequently, victims of this disorder face challenges in maintaining any meaningful relationship whether at home, workplace, school, or any other social setting. There have been calls from different quarters to change the name from BPD to Emotionally Unstable Personality Disorder (EUPD); however, these calls are still ungratified so BPD remains. Etiology Just like many other psychological disorders, BPD has no explicitly known causes; however, researchers and psychologists have come up with postulations that correlate strongly with BPD. These causes include environmental and neurobiological factors, genetic predisposition, and brain abnormalities. Childhood abuse tops the list of probable BPD causes. There are sufficient studies that link childhood abuse to BPD especially sexual abuse. Majority of individuals suffering from BPD have a history of childhood abuse. Studies show that, these people experienced emotional, physical, verbal, or sexual abuse from either their parents or caregivers. Child neglect also comes in as it plays the same role as abuse and many victims confess experiencing neglect in their childhood. Other studies show that BPD may be biologically linked and Millon (1996) posits that, “BPD may not necessarily be a trauma-spectrum disorder and that it is biologically distinct from the post-traumatic stress disorder that could be a precursor” (p. 660). A study carried on identical twins showed that if one of them has BPD, then the other has a 35% probability of having the same disorder, this insinuates the probability that BPD may be genetically linked. Moreover, some of behaviors expressed by BPD patients relate closely to those of serotonin function and regulation and this links this disorder to neurofu