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Conditions we treat

Western Sydney Local Health District Mental Health Services support people with a range of mental illnesses and disorders. 
Listed below are some of the most common disorders that are treated across our services. 


Mental illness

Mental illness is a term for a group of illnesses that may include symptoms that can affect a person’s thinking, perceptions, mood, or behaviour. 
Someone experiencing mental illness may find it difficult to cope with work, relationships, and other demands. 
Common mental health issues include:

  • Anxiety disorders
  • Behavioural and emotional disorders in children
  • Bipolar affective disorder
  • Depression
  • Dissociation and dissociative disorders
  • Eating disorders
  • Obsessive compulsive disorder
  • Paranoia
  • Post-traumatic stress disorder
  • Psychosis
  • Schizophrenia

This page lists the most common mental illnesses in more detail.

mental illness


People who are experiencing psychosis cannot tell what is real and what is not. Around 1 in every 200 adult Australians will experience a psychotic illness each year.

Psychosis affects people differently. They may experience: 

  • Hallucinations: hearing voices that aren’t there
  • Delusions: where people have false beliefs about themselves or the world around them

Psychosis can be caused by:

  • Mental illness: such as schizophrenia, bipolar disorder, or severe depression
  • Drug abuse
  • A response to stressful events, although this is less common

Mood Disorders

Mood disorders are characterised by a severe disturbance of mood that is associated with impaired function and/or a risk of harm to self, e.g. suicide, or others, e.g. aggression. The most common mood disorders treated in hospital are: 

  • Major Depressive Disorder
  • Bipolar disorder
eating disorders


Eating disorders

Eating disorders are serious mental illnesses that are estimated to affect almost 1 million Australians. They can affect people of all age groups, genders, backgrounds, and cultures.

Eating disorders include:

  • Anorexia Nervosa
  • Bulimia Nervosa
  • Binge Eating Disorder
  • Avoidant/Restrictive Food Intake Disorder (ARFID)
  • Other Specified Feeding or Eating disorders (OSFED)



Anxiety disorders are a group of mental health problems. Approximately 25% of Australians will need treatment for an anxiety disorder at some time in their life.  

Anxiety disorders include:

  • Generalised anxiety disorder (GAD)
  • Social phobias, which is often called social anxiety
  • Specific phobias, for example claustrophobia (fear of enclosed spaces) or arachnophobia (fear or spiders)
  • Panic disorders 
Other conditions and behaviours we treat

Other conditions and behaviours we treat

  • Chronic pain 
  • Huntington’s Disease: a brain disorder that affects movement, thinking, and mood
  • Cognitive delay/Intellectual disability (low to moderate functioning) 
  • Dementia Behavioural and Psychological Symptoms (BPSD): delirium, agitation, aggression, psychosis, or depression     
  • Clinical depression 
  • Self-harm   
  • Suicide attempts and/or suicidal ideation   
  • Emotion dysregulation difficulties  
  • Maladaptive coping strategies  
  • Impulsivity: an unstable sense of self   
  • Relationship challenges 
  • Patients who are at risk of placing others at risk of physical harm 
  • Current severe and/or chronic substance abuse  
  • Profound social withdrawal 
  • Attention deficit hyperactivity disorder (ADHD) 
  • Complex child psychiatry problems
  • Selective mutism