1.1 Introduction
Neurological disorders are medical conditions that affect the brain, spinal cord, and nervous system, leading to disruptions in movement, cognition, emotion, and behavior (World Health Organization, 2023). Mental health, on the other hand, refers to a state of emotional, psychological, and social wellbeing in which individuals are able to cope with normal life stresses, work productively, and contribute to their communities. Mental health challenges among patients with neurological disorders are increasingly recognized as a major public health issue due to their impact on quality of life, treatment adherence, and caregiver burden. Individuals living with dementia often experience confusion, agitation, and emotional instability, while those with Parkinson's disease may suffer from mood disorders and cognitive decline that are not always directly related to motor symptoms (American Psychiatric Association, 2023).
As a prelude to other parts of this study, this chapter will discuss the background upon which this study was initiated, the statement of problems that led to this study, the Aim and Objectives of the study. Others are significance of the study, scope of work, research hypothesis and questions, limitation of the study and definition of terms.
1.2 Background of Study
The study of mental health challenges in neurological disorders has evolved significantly over the past century as medical science has expanded its understanding of the brain-behavior relationship. Early neurological research primarily focused on structural and motor impairments, with limited attention given to psychological outcomes. According to World Health Organization, neurological disorders were initially classified and treated mainly based on physical symptoms, while mental health complications were often overlooked or misinterpreted as secondary reactions to chronic illness (WHO, 2023).
Neurological disorders are increasingly recognized as a major contributor to global disability and reduced quality of life, particularly when they are accompanied by mental health challenges. According to the World Health Organization (WHO, 2023), neurological conditions affect more than one billion people worldwide, making them one of the leading causes of disability and dependency. According to Alzheimer's Association (2023), dementia is defined as a progressive neurological condition characterized by deterioration in memory, reasoning, language, and the ability to perform daily activities. The organization reported that individuals living with dementia frequently experience psychological symptoms such as anxiety, agitation, depression, and social withdrawal, which significantly worsen their cognitive decline.
According to Parkinson's Foundation (2022), Parkinson's disease is a neurodegenerative disorder that primarily affects motor function due to the loss of dopamine-producing neurons in the brain. The foundation reported that beyond its motor symptoms such as tremors, rigidity, and bradykinesia, Parkinson's disease is strongly associated with mental health complications including depression, anxiety, psychosis, and cognitive impairment. It further asserted that nearly half of all patients with Parkinson's disease experience clinical depression at some point during the course of the illness, making it one of the most significant non-motor symptoms of the condition.
World Health Organization (2023) reported that, depression is a common mental disorder that affects more than 280 million people globally. WHO stated that depression is characterized by persistent sadness, loss of interest or pleasure in activities, reduced energy, and difficulty in carrying out daily tasks. It affirmed that depression may occur independently or co-exist with other chronic illnesses, including neurological disorders, thereby increasing the severity of health outcomes and reducing overall quality of life.
American Psychiatric Association (2023) stated that, mental health disorders often interact with neurological conditions in complex ways, making diagnosis and treatment more challenging. The association contends that psychiatric symptoms in neurological patients are frequently underdiagnosed due to the overlap between cognitive decline and emotional disturbances. It further stated that this diagnostic complexity contributes to inadequate treatment planning and poor patient outcomes, particularly in resource-limited healthcare settings.
According to Prince et al. (2016), neurological and mental health disorders share a bidirectional relationship where each condition can influence the onset and progression of the other. The authors reported that individuals with chronic neurological disorders are at a higher risk of developing depression and anxiety due to biological changes in the brain as well as psychosocial stressors such as dependency and social isolation.
According to Brooker and Morris (2018), dementia care requires a holistic approach that addresses both cognitive decline and psychological wellbeing. The authors stated that behavioral and psychological symptoms of dementia are among the most challenging aspects of care, often leading to increased hospitalization and caregiver strain. They contended that effective management requires early identification of mental health symptoms and the incorporation of psychosocial interventions alongside medical treatment (Brooker and Morris, 2018).
Reijnders et al. (2008) stated that, non-motor symptoms of Parkinson's disease, particularly depression and cognitive impairment, significantly reduce patients' quality of life more than motor symptoms alone. The authors reported that these psychological challenges are often overlooked in clinical practice, resulting in incomplete treatment approaches. They affirmed that comprehensive care for Parkinson's disease must include routine mental health assessment and intervention. Patel et al. (2018) affirmed that, depression remains a leading cause of disability worldwide and is strongly linked to chronic physical and neurological conditions. The authors stated that individuals with co-morbid depression and neurological disorders experience poorer treatment adherence, higher healthcare costs, and increased mortality risk.
In many healthcare systems, particularly in developing countries, mental health services remain underdeveloped and poorly integrated into neurological care. According to WHO (2023), there is a significant treatment gap in mental health services globally, with over 70 percent of individuals in low- and middle-income countries receiving no adequate treatment. On the other hand, caregivers of patients with dementia, Parkinson's disease, and depression also experience substantial psychological stress, including anxiety, burnout, and emotional fatigue. According to Schulz and Sherwood (2008), caregiving burden is a major public health issue that affects both physical and mental health of caregivers, often leading to reduced quality of life and increased risk of depression (Schulz and Sherwood, 2008).
This study is set against the backdrop of increasing global concern about the intersection of neurological disorders and mental health challenges, the rising burden of chronic neuropsychiatric conditions, and the need for improved integrated care approaches that address both neurological and psychological dimensions of health.
1.3 Statement of Problems
Investigation revealed that mental health services remain poorly integrated into neurological care in many low and middle-income countries, resulting in fragmented treatment approaches (WHO, 2023). There is also inadequate access to mental health professionals in neurological care units, particularly in developing regions such as Nigeria. In addition, caregivers often bear the burden of psychological support without adequate training or institutional assistance.
Furthermore, the mental health implications of these disorders are often complex and overlapping, making it difficult to clearly distinguish whether psychological symptoms are primary or secondary consequences of neurological deterioration. It is against this backdrop that this study seeks to examine and compare the mental health challenges experienced by patients with dementia, Parkinson's disease, and depression.
1.4 Aim and Objectives of Study
The aim of the study is to comparatively analyze mental health challenges among patients with dementia, Parkinson's disease, and depression in selected healthcare facilities in Lagos State, Nigeria. In achieving this aim, the following specific objectives were laid out as follows:
- To assess the mental health challenges experienced by patients with dementia in Lagos State, Nigeria.
- To examine the psychological effects associated with Parkinson's disease among patients in Lagos State, Nigeria.
- To evaluate the mental health status of patients diagnosed with depression in Lagos State, Nigeria.
- To compare the severity and patterns of mental health challenges across dementia, Parkinson's disease, and depression.
- To identify gaps in the current healthcare system in managing mental health challenges in neurological disorders in Lagos State, Nigeria.
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