A cancer diagnosis can have a profound impact on mental health, with research indicating that people with cancer experience higher rates of depression and anxiety compared to the general population. As advances in cancer detection and treatment have led to increasing numbers of cancer survivors, the mental health needs of this population have become a significant global challenge. Despite this, mental health concerns among people with cancer are often given limited attention during and after treatment, which primarily focuses on physical health symptoms and side effects.
Prevalence of Depression and Anxiety Among Cancer Patients
Research indicates that among individuals with no previous psychiatric history, a cancer diagnosis is associated with a heightened risk of common mental disorders. These conditions may adversely affect cancer treatment and recovery, as well as quality of life and survival outcomes. The prevalence of anxiety and depression among people with cancer is often higher than that in the general population, though estimates vary due to several factors including the type and stage of cancer, treatment setting, and time since diagnosis.
The scale of this issue is substantial. In 2018, an estimated 43.8 million people worldwide were living within five years of a cancer diagnosis across 36 countries and 185 populations. In the United States alone, the number of cancer survivors is projected to increase exponentially from 15.5 million in 2016 to 26.1 million by 2040. This growing population highlights the urgency of addressing mental health concerns in cancer care.
Risk Factors for Mental Health Issues in Cancer Patients
The development of depression and anxiety among people with cancer depends on a complex interplay of individual, psychological, social, and contextual factors, as well as characteristics related to the cancer itself and the treatment received.
Individual psychological responses to a cancer diagnosis can significantly impact mental wellbeing. The experience of diagnosis, particularly if delayed, can be a major source of distress and affect illness acceptance. Feelings of hopelessness, loss of control, and uncertainty about survival and death can have detrimental effects, especially in patients with a poor prognosis. Anxiety related to cancer diagnosis may also lead to sleep disturbance, which can increase the risk of depression.
The stigma surrounding both mental illness and certain types of cancer can contribute to psychological distress. For example, patients with lung cancer may experience guilt and shame due to the association between smoking and cancer, potentially contributing to the onset of depression.
Several factors related to the cancer and its treatment also impact mental health: - Type of cancer - Stage and prognosis - Long-term and late effects of treatment (such as secondary cancers, infertility, chronic pain, and insomnia)
Demographic and social factors similar to those in the general population may also increase vulnerability, including: - Age - Gender - Unemployment - Fewer educational qualifications - Lack of social support
Structural factors including healthcare costs, access to care, and access to welfare support such as disability benefits may also play a role, as cancer can have a significant financial impact on individuals and families.
Suicide Risk Among Cancer Patients
The risk of suicide among people with cancer is higher than in the general population for certain diagnoses that tend to have poorer prognoses, such as mesothelioma and lung cancer. This risk is particularly elevated in the first six months after diagnosis. Individuals who have previously engaged in suicidal behavior are likely to be particularly vulnerable.
Barriers to Mental Health Support for Cancer Patients
Several barriers prevent cancer patients from obtaining appropriate psychological support and treatment. A key issue is the lack of physician time for assessing psychiatric symptoms. There can also be a normalization of distress, with somatic symptoms of depression and anxiety being attributed to the cancer itself rather than recognized as mental health concerns.
Patients may not disclose psychiatric symptoms due to the stigma surrounding mental health conditions. Screening for depression and anxiety among patients with cancer is only of value if it leads to effective treatment and support that improves patient outcomes. Patients may be reluctant to discuss their mental health needs if they perceive a lack of effective treatment options.
The existing evidence for treating anxiety and depression among patients with cancer is limited and of varying quality. This lack of evidence-based interventions further complicates the provision of effective mental health care to this population.
Research Gaps and Future Directions
Research into the mental health and wellbeing of people living with and beyond cancer is significantly underfunded. In the UK, money spent on research into the biology of cancer was more than five times that spent on 'Cancer Control, Survivorship and Outcomes' during 2017/18. Research into mental health likely constitutes only a small portion of this already limited funding.
Several critical research gaps exist: 1. Lack of high-quality studies into the mental health of people with cancer following treatment and among long-term survivors, particularly for less prevalent cancer types and younger people 2. Limited research focused on prevention of depression and anxiety in cancer populations 3. Insufficient research covering low- and middle-income populations 4. Need for research on the possible impacts of long-term and late effects of cancer treatment on mental health 5. Need for studies on less common types of cancer 6. Need for inclusion of younger people and populations from low- and middle-income countries
The National Cancer Research Institute (NCRI) in the UK has recently highlighted research into the short-term and long-term psychological impacts of cancer and its treatment as a key priority, following surveys of over 3500 patients, carers, and health and social care professionals.
Positive Psychological Changes
While cancer diagnosis and treatment can lead to significant mental health challenges, some individuals may experience positive psychological changes in the long-term. These can include a greater appreciation of life and the ability to re-evaluate priorities. However, the factors that protect against the development of common mental disorders and contribute to positive mental health among people living with and beyond cancer require further research.
Conclusion
The mental health of people living with and beyond cancer is an important and growing research and clinical priority. Compared to the general population, the prevalence of anxiety and depression is often higher among people with cancer, but estimates vary due to numerous factors. Research is urgently needed into the prevention, care, and treatment of co-morbid depression and anxiety among people with cancer, particularly for long-term survivors and those experiencing the long-term and late effects of cancer treatment.
As the number of cancer survivors continues to grow globally, addressing mental health concerns must become an integral part of comprehensive cancer care. This requires increased funding for research, development of evidence-based interventions, improved screening and identification of mental health issues, and reduced stigma surrounding mental health in cancer populations.