Obsessive-Compulsive Disorder (OCD)

1. Definition and Overview: Obsessive-Compulsive Disorder (OCD) is defined as a disorder characterised by the presence of obsessions, compulsions, or both. Obsessions are recurrent and persistent thoughts, urges, or images that are experienced as intrusive and unwanted. Compulsions are repetitive behaviours or mental acts that an individual feels driven to perform in response to an obsession or according to rules that must be applied rigidly.
2. Obsessions: These are typically intrusive and unwanted thoughts, images, or urges that trigger intensely distressing feelings. Common themes include fear of contamination, having things in order, an obsession with symmetry, or aggressive or horrific thoughts about harming oneself or others.
3. Compulsions: These are behaviours an individual feels compelled to perform in an attempt to reduce distress or prevent a feared event or situation. These can include washing, cleaning, ordering, checking, or mental acts like praying, counting, or repeating words silently.
4. Insight Level: DSM-5 categorises Obsessive-Compulsive Disorder (OCD) based on the level of insight, which includes good or fair insight, poor insight, and absent insight/delusional beliefs. This categorisation is essential for treatment planning and prognosis.
5. Functional Impairment: Obsessive-Compulsive Disorder (OCD) often causes significant distress and impairment in social, occupational, or other important areas of functioning. The time spent on obsessions and compulsions can be extensive, sometimes taking up several hours of a person’s day.
6. Exclusion of Other Disorders: The DSM-5 requires that the obsessions and compulsions are not attributable to the physiological effects of a substance (e.g., a drug or medication) or another medical condition. Moreover, the disturbance is not better explained by the symptoms of another mental disorder (e.g., excessive worries as in Generalised Anxiety Disorder, preoccupation with appearance as in Body Dysmorphic Disorder, difficulty discarding as in Hoarding Disorder, hair pulling as in Trichotillomania, skin picking as in Excoriation Disorder, stereotypies in Stereotypic Movement Disorder, or ritualised eating behaviours in Eating Disorders).
7. Comorbidity: Obsessive-Compulsive Disorder (OCD) often co-occurs with other mental disorders, such as anxiety disorders, depressive disorders, tic disorders, and eating disorders. This comorbidity can complicate the clinical presentation and treatment.
8. Aetiology: The exact cause of Obsessive-Compulsive Disorder (OCD) is unknown, but it is believed to involve a combination of genetic, neurological, behavioural, cognitive, and environmental factors. Brain imaging studies have shown differences in the frontal cortex and subcortical structures of those with OCD.
9. Treatment: Treatment typically involves a combination of psychotherapy and medications. Cognitive Behavioural Therapy (CBT), particularly Exposure and Response Prevention (ERP), is considered the most effective type of psychotherapy for OCD. Medication typically includes selective serotonin reuptake inhibitors (SSRIs) or serotonin and norepinephrine reuptake inhibitors (SNRIs).
10. Prognosis: The course of OCD varies among individuals. While some people experience symptoms that come and go, others may have symptoms that persist over time. Early diagnosis and treatment can help improve the outcome.

Breakdown of Criteria for Obsessive-Compulsive Disorder:

Criterion A (Presence of Obsessions, Compulsions, or Both):

• Obsessions are defined by:
  • Recurrent and persistent thoughts, urges, or images that are experienced as intrusive and unwanted, and that in most individuals cause marked anxiety or distress.
  • The individual attempts to ignore or suppress such thoughts, urges, or images, or to neutralise them with some other thought or action (i.e., by performing a compulsion).
• Compulsions are defined by:
  • Repetitive behaviours (e.g., hand washing, ordering, checking) or mental acts (e.g., praying, counting, repeating words silently) that the individual feels driven to perform in response to an obsession or according to rules that must be applied rigidly.
  • The behaviours or mental acts are aimed at preventing or reducing anxiety or distress, or preventing some dreaded event or situation; however, these behaviours or mental acts are not connected in a realistic way with what they are designed to neutralise or prevent, or are clearly excessive.

Criterion B (Time Consuming or Cause Clinically Significant Distress or Impairment):

• The obsessions or compulsions are time-consuming (e.g., take more than 1 hour per day) or cause clinically significant distress or impairment in social, occupational, or other important areas of functioning.

Criterion C (Not Attributable to Substance or Medical Condition):

• The obsessive-compulsive symptoms are not attributable to the physiological effects of a substance (e.g., a drug of abuse, medication) or another medical condition.

Criterion D (Not Better Explained by Another Mental Disorder):

• The disturbance is not better explained by the symptoms of another mental disorder (e.g., excessive worries, as in Generalised Anxiety Disorder; preoccupation with appearance, as in Body Dysmorphic Disorder; difficulty discarding or parting with possessions, as in Hoarding Disorder; hair pulling, as in Trichotillomania; skin picking, as in Excoriation Disorder; stereotypies, as in Stereotypic Movement Disorder; ritualised eating behaviour, as in Eating Disorders; preoccupation with substances or gambling, as in Substance-Related and Addictive Disorders; preoccupation with having an illness, as in Illness Anxiety Disorder; sexual urges or fantasies, as in Paraphilic Disorders; impulses, as in Disruptive, Impulse-Control, and Conduct Disorders; guilty ruminations, as in Major Depressive Disorder; thought insertion or delusional preoccupations, as in Schizophrenia Spectrum and Other Psychotic Disorders; or repetitive patterns of behaviour, as in Autism Spectrum Disorder).

This outline is based on the DSM-5 criteria and general psychological research on OCD. Each individual’s experience of OCD can vary widely, and a thorough assessment by a mental health professional is necessary for an accurate diagnosis and appropriate treatment plan.