Introduction

Anosognosia, often referred to as "insight deficit," is a neurological phenomenon in which a person is unaware of their own condition, the extent of their symptoms, or related difficulties.^1,2 Unlike denial or stubbornness, anosognosia stems from the brain's inability to recognize and process that one’s perception of events does not align with reality and, therefore is thought to be caused by a lack of neuropsychological capacity. It affects a wide range of neurological and psychiatric conditions, including  Alzheimer’s, bipolar disorder, major depression, anorexia nervosa, and brain damage from stroke. However, it is most prevalent in schizophrenia, with studies estimating that 50–98% of individuals with this diagnosis are affected.¹

In schizophrenia, anosognosia is not only common but also deeply consequential, as it often manifests as an inability to recognize hallucinations and delusions as detached from reality. This lack of insight is considered a direct symptom of anosognosia, thought to arise from neuropsychological impairments. Additionally, anosognosia in schizophrenia may coincide with physical symptoms such as aphasia and hemianopia and is particularly evident during psychotic episodes or relapse.^1,3

This article explores the symptoms, underlying factors, treatment options, and interventions for anosognosia, with a focus on its impact on schizophrenia and the crucial role caregivers play in managing this challenging condition.

Symptoms of anosognosia

Anosognosia significantly affects an individual’s ability to recognise their condition, leading to challenges in both personal and clinical contexts. These challenges often deeply impact treatment, social interactions, and overall well-being. Below are some of the key ways anosognosia may manifest:¹

• Denial of illness: The person may refuse their diagnosis or the presence of symptoms
• Rejection of treatment: As they may not believe they are unwell, the person may refuse medication, hospitalisation, and other forms of treatment, seeing them as unnecessary
• Not recognising symptoms: The person may not perceive symptoms such as hallucinations, delusions, or mood swings as unusual or troublesome (characteristic for a psychotic episode)
• Not recognising behavioural changes: As they experience a decline in cognitive functioning or emotional expressions, people with anosognosia may withdraw from social activities and work, and show or experience a smaller range of emotions, but may not recognise these changes 
• Rationalising symptoms: When confronted by others about their symptoms, people experiencing anosognosia may attribute hallucinations or delusions to other external factors, justifying unusual occurrences
• Resistance to discussing mental health: People experiencing anosognosia may become agitated or defensive when others try to talk to them about their mental health
• Difficulty maintaining treatment: Due to their reduced awareness of symptoms, people experiencing anosognosia may struggle with regularly taking prescribed medication. This can lead to frequent relapses and worsening of symptoms. Repeated relapses may also lead to an overall deterioration in mental health.
• Struggling to maintain a social or work life: As they may not engage with treatment, worsening symptoms can cause the person experiencing anosognosia to withdraw socially. They may also struggle to perform at work. 

Contributing factors 

Evidence suggests that schizophrenia and, specifically, anosognosia originate in the prefrontal cortex of the brain. The prefrontal cortex is responsible for functions such as working memory, decision-making, self-monitoring, self-image, and organisation. Researchers found that the volume of these areas in the frontal lobe is linked to awareness of symptoms. It is thought that damage to the frontal lobe may be the reason patients are unable to update the image they have of themselves to include mental illness and associated symptoms.^1,2,5 

Another comprehensive study shows a robust relationship between the high scores on the Wisconsin Card Sorting Test (WCTS) and the level of insight of patients with schizophrenia. The WCST was developed as a measure of abstract reasoning, mental flexibility, and the ability to strategise as a response to environmental change and it can therefore be argued that lower scores of reasoning and mental adaptation may be linked to anosognosia.^1,2,4 

There is no strong evidence that age, gender, or cultural background are also contributing factors to developing anosognosia.⁴

Treatment for anosognosia

There is no definitive treatment for anosognosia, but symptom management and education about the condition are currently seen as best practices. 

Clinical management

The most important part of clinical management is adhering to the prescribed medical regimen. Antipsychotic medications can effectively reduce the symptoms of anosognosia by controlling the negative symptoms of psychosis. However, they must be taken regularly to prevent worsening symptoms which can make it harder to restart the regimen.⁶ 

Electronic reminders and electronic pillboxes can be helpful aids for enabling people with schizophrenia to self-manage symptoms and maintain awareness of where they might lack insight. Electroconvulsive Therapy (ECT) and Transcranial Magnetic Stimulation (rTMS) have been used in the past as treatments for anosognosia. However, understanding of their benefits appears limited.^1,2

Psychological interventions 

Psychological interventions for anosognosia can help with a multitude of symptoms. For example, cognitive behavioural therapy (CBT) can be used to help the person experiencing anosognosia challenge irrational beliefs and thoughts, helping them to gain insight. Motivational interviewing (MI) can be used to encourage the person to accept their diagnosis, engage with treatment and take medication as prescribed.⁶ Occupational therapy and social skills training promote cognitive and social understanding and support independent living. Engaging in community treatment programs or support groups can offer individuals the chance to connect with others who share similar experiences, pursue comparable treatments, and gain a deeper understanding of their condition.

Role of caregivers 

Caregivers play an important role for people whose ability to care for themselves may become limited, particularly during a relapse in their mental health. Aside from giving practical help with daily tasks, caregivers can provide a safe space by creating a non-judgmental and understanding approach. This can, in turn, help the person to feel more open to acknowledging their diagnosis and their support needs, and to seek treatment. Caregivers also play an important role in monitoring adherence to medication and changes, or fluctuations, in symptoms. They play a key role as a link between the person they support and medical professionals, helping them to navigate the healthcare system and advocating for their needs.⁸

The nature of anosognosia means that the person may refuse to seek or receive help from others and may feel misunderstood and isolated.6,7 On the other hand, family and friends may also feel frustrated, distanced, and helpless as they may not understand the full impact of anosognosia on a person’s ability to accept their diagnosis or therapeutic interventions for it.⁸ It is through their support, advocacy, and direct involvement in care and treatment processes that caregivers can significantly influence the quality of life for someone who has schizophrenia. This includes effective symptom management and awareness of relapse triggers and early warning signs, which can optimise access to effective treatment.

Caregiving can sometimes involve challenging situations and conversations, as well as feeling a lot of concern about the person who is being supported. Therefore, caregivers must be provided with resources, support, and strategies for their self-care. 

Summary

Anosognosia, a symptom of various neurological conditions, is characterised by reduced self-awareness of one’s condition or its severity. It is distinctly different from denial or stubbornness. This symptom is especially prevalent in schizophrenia, where it is more resistant to treatment compared to other conditions.

Key symptoms of anosognosia include denial of illness, rejection of treatment, and the rationalisation of symptoms. These challenges are often linked to damage in the brain’s frontal regions, which are responsible for self-monitoring and abstract reasoning. Treatment typically involves a combination of antipsychotic medication and psychological interventions, such as cognitive-behavioral therapy.

Caregivers play an integral role in supporting individuals with anosognosia by assisting with daily tasks, ensuring medication adherence, and advocating for their needs. However, caregivers often face challenges, such as navigating complex healthcare systems and balancing their own physical and emotional well-being.

Providing support for caregivers is vital to improving therapeutic outcomes and ensuring effective management of anosognosia in schizophrenia.