Identifying disorders and why it's not as simple as it seems

Characteristics for disorders (DSM-IV)

SCHIZOPHRENIA

• Psychotic disorder
• Generally characterised by loss of contact with “reality”
• Must have 2+ symptoms, as well as socio-occupational dysfunction
• Positive symptoms such as delusions, hallucinations and disordered thought/speech/actions
• Negative symptoms such as loss of contact with reality, catatonia, loss of pleasure in usual activities and loss of emotional responses

DEPRESSION

• Affective disorder, so most linked to mood changes
• Can be unipolar or bipolar as well as dysthymic (chronic)
• Must have 5+ symptoms to be classified as depression
• Behavioural symptoms include loss of pleasure and loss of appetite
• Physical symptoms include catatonia, fatigue and insomnia
• Cognitive symptoms include poor concentration and suicidal thoughts
• Emotional symptoms include feelings of worthlessness and persistent negative moods
• Bipolar disorder includes episodes of these characteristics alongside manic episodes, including delusions of grandeur, excessive happiness and feeling restless (those with bipolar may be confused with schizophrenia due to the occasional presence of delusions and disordered speech, thought or actions)

PHOBIA

• Anxiety disorder
• Persistent, excessive fear or anxiety and recognised as so
• Immediate fear response on contact
• Actively seeks to avoid phobic situation
• Disruption to everyday life
• May seem irrational to others but has very real consequences to the individual

Issues with identifying disorders:

• Highly subjective
• Requires self-report from individuals who may not perceive their behaviour as abnormal or dysfunctional, or who may be prone to lying/disordered thoughts and social desirability
• There is significant overlap between disorders e.g. loss of pleasure is a factor in depression and schizophrenia, whilst bipolar disorders and schizophrenia can feature delusions and disordered actions. Anxiety is also somewhat common amongst people who are depressed, due to feelings of worthlessness and pessimistic depressive thought patterns.