Review Article: Integrating Depression and Chronic Pain in Older Adults: A Clinical Framework for Comprehensive Geriatric Care

Review Article: Integrating Depression and Chronic Pain in Older Adults:
A Clinical Framework for Comprehensive Geriatric Care

Mimoun Azizi ¹, Dr. Med. Franklin Famdie Simo ², Ibrahim Krenawi *³

1. Chief Physician, Senior Consultant Neurologist and Neurogeriatrician, Klinikverbund Südwest, Sindelfingen, Germany.
2. Senior Consultant Neurologist and Neurogeriatrician, Germany.
3. Consultant Neurologist, Ain Alkhaleej Hospital, Al Ain, UAE.

*Correspondence to: Ibrahim Krenawi, Consultant Neurologist, Ain Alkhaleej Hospital, Al Ain, UAE.

Copyright

© 2026 Ibrahim Krenawi, This is an open access article distributed under the Creative Commons Attribution  License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Received: 13 July 2026

Published: 01 August 2026

DOI: https://doi.org/10.5281/zenodo.21714098

Abstract

The coexistence of chronic pain and depression in older adults represents a major yet under-recognized clinical challenge in geriatric medicine. These neurobiological and psychosocial processes overlap between both conditions, which are monoaminergic dysregulation, neuroinflammation, HPA-axis hyperactivity, and behavioral deactivation. This comorbidity results in major functional dysfunction, cognitive deterioration, and treatment adherence, requiring a combined approach in treatment. This review encapsulates the existing information regarding epidemiology, common mechanisms, evaluation of older adults with both pain and depression, and management. It underscores the necessity of integrated pharmacological treatment, especially serotonin-norepinephrine reuptake inhibitors (SNRIs), as well as psychotherapeutic, behavioral, and rehabilitative interventions. The most promising directions for enhancing the quality of life and regaining independence are emphasized as collaborative, measurement-based, and function-centered care models. The prevention of pain and mood as co-occurring and not separate issues is the key to the ultimate and holistic geriatric care.

Keywords: Depression in older adults, Chronic pain management, Geriatric depression, Pain and mood disorders, Integrated care for seniors, Treatment-resistant depression, SNRIs for chronic pain.

Abbreviations

Introduction

Comorbidity of chronic pain and depression in the elderly is one of the least acknowledged but the most clinically significant problems of contemporary geriatric care. The two conditions are disabling in their own right, but when combined, they form a self-reinforcing loop that reduces functionality, thinking, sleep quality, and overall well-being [1]. The overlap in aging patients is more than a coincidence; this is evidence of tightly intertwined processes, biological, psychological, and social, all interacting over time and making it difficult to manage at all stages of care.

Clinically, pain and mood have a two-way, enhancing relationship. Depressive symptoms that are commonly observed in older adults attaining total musculoskeletal, neuropathic, or visceral pain are anhedonia, fatigue, and lack of motivation. On the other hand, somatic complaints and increased pain perception are characteristic features of depression in later life. Such reciprocity breeds diagnostic uncertainty and usually postpones proper care. Research has repeatedly revealed that elderly people with chronic pain have a much higher risk of developing depression, and depressed people are equally subject to prolonged and debilitating pain syndromes [2].

Moreover, there is a high functional and prognostic value in this dual burden. The elderly patients who have both depression and pain have increased disability, decreased mobility, withdrawn social lives, and a significantly lower quality of life [3]. Notably, they are more susceptible to treatment resistance where traditional antidepressant measures do not result in complete remission [4]. The specific group of patients may usually demand to be treated with special, multidisciplinary care encompassing pharmacologic, psychological, and rehabilitative treatment options.

Clinical significance of this comorbidity is not limited to the control of symptoms, depending on the population's health point of view. The incidence of chronic pain disorders and mood disorders is on the increase as the age of the society increases; a trend that is facilitated by multimorbidity, neurodegeneration, polypharmacy, and the psychosocial stressors that include bereavement and isolation. In this regard, pain and depression should be treated as related clinical issues instead of coexisting ones to increase the quality of geriatric medicine.

Put differently, depression and chronic pain among older adults are two aspects of the same phenomenon, which are interconnected via a common set of neurobiological mechanisms, common psychosocial risk and predisposing factors, as well as reinforcing each other. This complex interaction in aging people is discussed in the following sections in terms of epidemiology, mechanistic basis, assessment issues, and integrative treatment approaches.

Epidemiology

How Common Is This Dual Burden?

The coexistence of chronic pain and depression in older adults is far more than a coincidental overlap; it is a clinically entrenched comorbidity that profoundly affects morbidity, mortality, and quality of life. Epidemiologic evidence on differing populations reveals consistently that chronic pain and late-life depression are regularly comorbid, and each one exacerbates the other.

The incidence of this dual burden is impressive in geriatric cohorts. In a large-scale study of Chinese centenarians and the “oldest-old”, it was found that 12.6% of subjects had chronic pain and symptoms of depression co-morbid, so that chronic pain raised the risk of depression in late life by nearly 60% and depression also raised the risk of chronic pain [5]. Wider studies have reported that of the community-dwelling older adults, 30-50% who report moderate to severe levels of chronic pain also qualify according to diagnosing criteria of a depressive state [2]. These are particularly high among those who have multisite pain, functional decline, or comorbid medical illness, particularly musculoskeletal, neuropathic, or inflammatory conditions.

Clinically, it is a high-risk phenotype of geriatric practice -high-risk comorbidity frequently related to treatment resistance and functional deterioration. According to a systematic review of randomized controlled trials in adults (55 years old and above) with an average age of about 65 years, treatment-resistant depression (TRD) is frighteningly frequent, even under the conditions of using modern pharmacologic and psychotherapeutic strategies [4]. In a large number of such instances, comorbid pain syndromes were found to be significant factors leading to low antidepressant response and prolonged recovery courses.

The interplay between aging, chronic pain, and mood dysregulation is further compounded by multimorbidity and polypharmacy — hallmarks of geriatric medicine. These chronic medical conditions include osteoarthritis, diabetic neuropathy, cardiovascular disease, and cerebrovascular pathology, which is associated with a pro-inflammatory systemic state and changes the pain perception thresholds. This physiological basis can serve as a reason why older adults not only live with the pain longer but also show a heightened vulnerability to depressive relapse.

Regarding the healthcare utilization perspective, adults in the age group of 50 years and above with co-occurring pain and depression have been recorded as the most common consumers of both primary care and specialty care. They are frequently subjected to frequent changes of medicine, hospitalization, and functional deterioration before a unified, integrated management approach is started [6]. This highlights a significant vacuum within any existing geriatric care paradigm in which the two symptoms of depression and pain continue to be regarded independently as opposed to being symptoms of a common pathophysiologic/psychosocial continuum.

To conclude, this comorbidity is both prevalent and causal as seen through the epidemiologic evidence. Its awareness should invariably prompt a wholesome integrative evaluation of clinical practice - an evaluation that puts emphasis on functional recuperation, symptom interdependence, and prevention of therapeutic resistance. The initial move in solving one of the most widespread and undervalued issues of contemporary geriatric medicine is to realize its real prevalence.

Understanding the Link — Shared Biological and Psychosocial Mechanisms

The comorbidity of chronic pain and depression in older adults is not merely a coincidence but rather the result of intersecting biological, psychological, and social mechanisms. A complex feedback loop is formed by these processes that maintains both conditions and makes it harder to recover. The knowledge of such common pathways is essential in the context of clinicians who seek to provide integrated and mechanism-based care as opposed to symptom-based treatment.

Neurobiological Pathways

The fundamental basis of this interaction is a common neurochemical and neurocircuitry basis. Chronic pain and depression are conditions that imply dysregulation of monoaminergic systems, specifically, serotonin (5-HT) and norepinephrine (NE), that play a key role in regulating mood and pain regulation, respectively [7]. These neurotransmitters are deficient, which damages descending pathways of the periaqueductal gray, rostral ventromedial medulla, and limbic structures, leading to increased sensitivity to pain and a loss of mood resilience [2].

Moreover, neuroinflammation and glial activation are typical features of chronic pain, which results in the increase of such pro-inflammatory cytokines as IL-6, TNF-α, and CRP. These mediators of inflammation disrupt monoamine production and stimulate neuroendocrine stress responses through the hypothalamic-pituitary-adrenal (HPA) axis, which is also a characteristic pathway in late-life depression. Hypersensitivity of the HPA-axis, which is prevalent in both disorders, plays a role in the neuronal atrophy of the hippocampus and prefrontal cortices, thus enhancing emotional dysregulation and maladaptive pain perception.

The neuroimaging evidence in depressed elderly individuals often shows white matter hyperintensities, cortical volume loss, and neurotrophic support loss, which is associated with cognitive impairment as well as chronic pain susceptibility. These structural and functional alterations occurring simultaneously enhance the disability burden, retards rehabilitation, and increase vulnerability to treatment-resistant depression [4].

Psychosocial and Behavioral Dynamics

In addition to neurobiology, psychosocial factors play the same role in maintaining the pain-depression cycle. Chronic pain is a common disease that causes lack of physical activity, sleep disturbance, and social isolation, which worsen the signs of depression [8], [9]. Depression, on the other hand, not only exaggerates the subjective experience of pain with the help of attentional bias, catastrophizing, and behavioral deactivation. These vicious cycles create a vicious cycle of self-reinforcement - depression causes withdrawal and inactivity, and vice versa.

In the older population, this interrelation is intensified by age-related susceptibility: sensory impairments, loss of mobility, bereavement, cognitive dysfunction, and comorbidities. The cognitive impairment, especially the executive dysfunction, reduces adherence to multifaceted medication courses and disrupts the regular use of pain-management/antidepressant techniques. The outcome is chronic low resilience, low coping capacity, and functional deterioration.

Clinical Implications of These Overlaps

The identification of the similarities in the mechanisms of pain and depression has significant therapeutic consequences. The most rational approach is to treat both systems simultaneously. The example of serotonin-norepinephrine reuptake inhibitors (SNRIs) like duloxetine reflects this principle, and it is aimed at central pain pathways and mood disorders [10]. Similarly, behavioral activation and cognitive-behavioral therapy (CBT) facilitate re-investment of physical and social activities, which focus on pain interference, as well as emotional withdrawal.

Regarding the practical aspect of this issue, the clinician needs to think of pain and depression as biologically reinforcing conditions and not as parallel disorders. This knowledge advances integrative treatment planning - the combination of pharmacologic with psychological to rehabilitative modalities to break the pain-depression cycle and recovery. With the further development of modern geriatric medicine, addressing the common pathways will remain a focus of maximizing emotional and physical outcomes in the elderly population.

Table 1: Clinical Implications of These Overlaps

Challenges in Assessment Among Older Adults

One of the most delicate parts of geriatric practice in clinical practice is the accurate evaluation of depression and chronic pain in older adults [11]. Both disorders often co-exist, are symptomatically overlapping, and are multi-factorial regarding medical, cognitive, and social variables. To do a good assessment, it is not only necessary to be diagnostic but to have sensitivity about the influence of aging physiology, comorbid conditions, and the context of life on the presentation of the patient.

Diagnostic Complexity and Symptom Overlap

Older adults tend to express depression in an atypical manner and to experience somatic symptoms (excessive fatigue, sleeping problems, lack of confidence in eating, or slow cognition) but not overt sadness. These characteristics can be readily attributed to getting old, drug influences, or an underlying medical condition. Equally, chronic pain syndromes (neuropathic, musculoskeletal, or inflammatory) are so common in geriatrics that they are often undervalued in terms of their psychological effect. The outcome is underdiagnosis or misclassification, thereby resulting in disjointed or delayed treatment [2].

Clinicians are to be aware of the bidirectionality nature of these symptoms: the presence of unresolved pain can trigger depressive episodes, whereas the presence of depression can lead to the perception of pain being more intense due to the process of central sensitization and attentional bias. The inability to identify such an interaction often leads to partial recovery or resistance to treatment [4].

Assessment Tools and Functional Emphasis

Assessment is still based on validated instruments, which need adjustment to the needs of older adults.

• In the case of depression, an instrument like the Geriatric Depression Scale (GDS) and the Patient Health Questionnaire-9 (PHQ-9) (geriatric version) is useful and valid [12].
• In the case of pain, the Numeric Rating Scale (NRS) and Brief Pain Inventory (BPI) are most commonly applied, but it is up to the clinician to make sure that his or her self-reporting is properly conducted in terms of cognitive and sensory abilities.

More importantly, evaluation must not be limited to symptom checklists. The evaluation should focus on the functional impact of pain and mood on everyday life mobility, social interactions, sleep quality, appetite, and independence. The diagnosis and treatment objectives should be based on functional recovery, rather than symptom reduction.

Influence of Comorbidity, Polypharmacy, and Cognition

The elderly often appear with multimorbidity and polypharmacy, which clouds the clinical image. Arthritis, diabetic neuropathy, cardiovascular disease, and cognitive impairment are conditions that may produce or conceal depressive symptoms [13]. Drugs such as beta-blockers, corticosteroids, benzodiazepines, and opioids can also contribute to worsening fatigue, apathy, or mood blunting.

There is additional complexity of cognitive impairment, especially executive dysfunction. Patients can experience problems in describing their amount of pain, the period of their symptoms, or in adherence to their treatment. The standard cognitive screening (e.g., MoCA or MMSE) should thus be considered part of the first assessment, and treatment plans must be realistic and safely applied.

Safety and Tolerability Considerations

It is the elderly who are peculiarly susceptible to adverse drug effects and iatrogenic damage. Antidepressants, especially SSRIs and SNRIs, may result in hyponatremia, orthostatic hypotension, or falls [14]. Even tricyclics, which are effective in neuropathic pain, have anticholinergic and cardiac conduction effects. Likewise, opioids and sedative agents increase the chances of functional impairment and cognitive loss.

In such a way, the principles of geriatric prescribing, such as “start low, go slow, but go”, are still indispensable. Risk can be averted through a structured medication review during each visit, particularly in patients who are already on an analgesic, hypnotic, or polypharmacy regimen.

Recognizing Treatment Resistance Early

Some of the aged patients develop a treatment-resistant depression (TRD), defined as a condition of failing to respond adequately to two or more sufficient antidepressant treatments. The definition is, however, clinically flexible in older patients as there are changes in pharmacokinetics, comorbidity, and delayed response to treatment. In cases of comorbid pain, the resistance, in many cases, is an indicator of the unaddressed biological overlap or the insufficient merging of the pain and mood management, but not actual pharmacologic failure [4].

The diagnosis of the TRD in this group at an early stage should activate a multidisciplinary review, that is, psychiatry, pain medicine, geriatrics, and rehabilitation, to reassess treatment goals, balance medications, and consider neuromodulation or behavioral therapy before the functional deterioration becomes irreversible.