It can be found in the context of schizophrenia and delusional disorder, such as bipolar disorder, but is also associated with alcoholism and sexual dysfunction and has been reported after neurological illness (i.e. Parkinsons). The name "Othello Syndrome" comes from the character in Shakespeares play Othello, who murders his wife as a result of a false belief that she has been unfaithful. Recently, some psychologists and psychiatrists have asserted that Othello was deceived rather than deluded about Desdemonas alleged infidelity and thus did not have ‘the Othello Syndrome’. Psychiatric history
Presenting difficulties: neurotic or psychotic jealousy
Past psychiatric history: neurotic or psychotic disorders, deliberate self-harm and attempted suicide
Family history: mental illness including pathological jealousy
Relationship history: incorporating both the current and previous relationship and taking account of the quality of the relationships and the difficulties experienced
Forensic history: previous and pending charges and convictions as well as deviant behavior which was not reported or did not result in a charge or conviction (including aggressive behavior and stalking)
Medical history: organic causes which may be responsible for the morbid jealousy (i.e. Parkinsons)

Forms
Obsessions: the individuals own thoughts are egodystonic; they are acknowledged to be senseless, and usually resisted. Jealous thoughts are experienced as intrusive and excessive, and compulsive behavior such as checking up on their partner may follow. Egodystonicity (the distress caused by thoughts that are unwanted and viewed as contrary to conscious wishes) generally varies a large amount between patients and “a continuum from obsessional to delusional, which morbid jealousy has been suggested” (Insel & Akiskal 1986).
Harm to self
Suicidal thoughts are common in morbid jealousy, especially because of its association with depression and substance abuse. Risk to others
Violence can occur in any relationship tainted with jealousy, either normal or morbid jealousy. In a recent study of jealousy by Mullen & Martin in 1994, 15% of both men and women reported that at some time they had been “subjected to physical violence at the hands of a jealous partner.” Culturally, jealousy may be even used to “justify violence towards partners.” Victims in a homicide case are most likely to be current or ex-partners in both female and male perpetrators. When a partner repeatedly denies infidelity, this may provoke anger and extreme violence. On the other hand, the partner that is suffering may give up and give a false confession, which in turn most likely will provoke rage in the jealous individual. In the U.S. a sample was taken of 20 participants with delusional jealousy. 19 were male and Silva (1998) found that 13 had threatened to kill their spouse because of their perceived infidelity. Of the 13 males, nine actually attacked their spouse. Out of the 20, a weapon was used by three of them, and 12 had harmed their spouse. A presence of paranoid delusions and hallucinations of injury to the spouse were most often associated with violence. This suggests that individuals that suffer from delusional jealousy that partake in violence may be solely driven by psychotic phenomena. A higher risk of assault was associated with alcohol consumption.