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Systematic review of mental health comorbidities in psoriatic arthritis



In this systematic review and meta-analysis of psoriatic arthritis (PsA) studies, we pooled data from existing literature to (1) estimate the prevalence of mental health disorders in PsA patients and (2) compare disease activity in PsA patients with and without these comorbidities.


We searched PubMED, Web of Science, Scopus, PsycINFO and the Cochrane Library using a predefined protocol in accordance with Preferred Reporting Items for Systematic reviews and Meta-Analyses (PRISMA) guidelines. Where possible, meta-analysis was performed using random effects model. Prevalence estimates were pooled according to the severity of mental health disorders.


A total of 24 studies, amounting to 31,227 PsA patients, were included for review. Anxiety and depression were the only consistently reported mental health disorders, defined using a range of screening criteria/thresholds. Anxiety prevalence ranged from 4 to 61% with a pooled estimate of 33% (95%CI 17 to 53%) having at least mild anxiety and 21% (95%CI 14 to 29%) at least moderate. Depression prevalence ranged from 5 to 51%, with 20% (95%CI 8 to 35%) having at least mild and 14% (95%CI 8 to 21%) at least moderate. Only two studies compared disease activity according to the presence of mental health comorbidities; both reported higher disease activity and pain among those with comorbid anxiety and depression.


Anxiety and depression are highly prevalent among PsA patients. Studies of other mental health disorders were scarce. More studies are needed on the impact of these comorbidities on disease activity and long-term outcomes.

Key Points
One in three patients with psoriatic arthritis has at least mild anxiety, while 1 in 5 reported at least mild depression.
PsA patients with anxiety and/or depression reported greater disease activity.
More research is needed on other mental health comorbidities, particularly sleep, suicide/self-harm and substance misuse.


Psoriatic arthritis (PsA) affects 0.3 to 1% of the general population and up to 30% of those with psoriasis [1]. The articular manifestations can be debilitating, afflicting varying number and distribution of peripheral joints as well as the axial skeleton. In addition, multiple domains of health can be affected by skin involvement, numerous other disease features (e.g. enthesitis, dactylitis, nail disease, uveitis) and additional, co-existing morbidities [2]. Mental health disorders are an important and highly prevalent group of comorbidities in patients with psoriasis [3], but their prevalence and impact in PsA have not been systematically reviewed. Prevalence of these comorbidities may differ between the two disease groups since PsA cohorts tend to be older and have a longer duration of skin involvement—the majority of PsA patients have had skin involvement for ~ 10 years [1]. Psoriasis patients who develop arthritis have higher levels of fatigue and psychological distress [4]. In patients with PsA, joint involvement appears to affect the quality of life to a greater extent than skin [5].

Improving the understanding of mental health comorbidities in PsA has significant clinical implications. Studies have shown that patients with depression have increased the perception of pain [6]. Poor mental health is also a key predictor for secondary fibromyalgia [7] which, in turn, is associated with worse patient-reported outcomes [8]. These comorbidities present challenges when trying to treat PsA to target. Composite treatment targets, such as DAS28 [9] or minimal disease activity [10], include components (tender joint count, pain and patient global visual analogue scales) that may be influenced by comorbid mental health conditions. Treatment escalation driven by non-inflammatory symptoms may lead to toxicity. This is particularly important in PsA management since tight control was associated with more adverse events than standard care, was not superior for radiological damage, and only provided modest improvements to the quality of life [11].

The aims of this systematic review were to (1) describe the prevalence of comorbid mental health disorders in PsA and (2) compare disease activity scores in PsA patients with and without these  comorbidities.


We conducted a systematic review in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines [12]. The protocol was registered in advance (PROSPERO: CRD42017079841). We searched PubMED, Web of Science, Scopus, PsycINFO and the Cochrane Library through February 2019. Details of the search strategy are shown in Supplementary Materials.

Studies recruiting adult patients were included if they reported the prevalence of a comorbid mental health disorder or assessed the effect of a comorbid mental health disorder on disease activity. Studies were excluded if they used non-representative sampling (highly selective recruitment criteria, such as studies that only recruited women), had a sample size of less than 30 (to avoid unreliable prevalence estimates) or used the same cohort as an existing study. Only full-length articles were considered; reviews, comments and editorials were excluded.

Two reviewers independently assessed the eligibility of articles for inclusion and extracted data from suitable studies. Disagreements were resolved through discussion moderated by a third reviewer. Information from included studies was extracted into predefined tabulated summaries containing: study design, sample size, criteria used to diagnose the psoriatic arthritis and mental health disorders, age gender and prevalence of comorbid mental health disorders. Where available, disease activity scores for patients with and without comorbid mental health disorders were also extracted.

Commonly used thresholds for each screening tool were applied to categorise severity of depression. For the Hospital Anxiety and Depression Scale (HADS) anxiety and depression subscales, a scale of ≤ 7 was interpreted as no anxiety/depression, 8 to 10 as mild, 11 to 14 moderate, and ≥ 15 severe [13]. The Patient Health Questionnaire (PHQ-9) thresholds were ≤ 5 no depression, 6 to 10 mild, 11 to 14 moderate and ≥ 15 severe [14]. Hamilton Depression Scale (HAM-D) is as follows: ≤ 7 no depression, 8 to 13 mild, 14 to 18 moderate and ≥ 19 severe depression [15]. For the Generalised Anxiety Disorder questionnaire (GAD-7), a scale of ≤ 5 was taken to indicate no anxiety, 6 to 9 mild, 10 to 14 moderate and ≥ 15 severe [16]. Studies that used similar thresholds were grouped together. We also included studies using components from the quality of life questionnaires to screen for anxiety or depression. The 5-domain EuroQol questionnaire (EQ-5D) has a single question with the options: I am not anxious or depressed; I am moderately anxious or depressed; I am extremely anxious or depressed. Although not a validated method, single-item screening questionnaires have good sensitivity and specificity [17]. The Short-Form Health Survey (SF-36) mental health subscale (MH) and mental component summary (MCS) score also perform well as a screening method [18]. The PsA quality of life questionnaire includes one item “I feel there is no enjoyment in my life” [19]. If a study reported depression prevalence using two different thresholds, it could contribute to more than one pooled estimate.

Quality assessment of included studies was performed using the Newcastle-Ottawa Scale (NOS), adapted for cross-sectional studies [20]. Articles were assigned up to six stars depending on the rigour of the methodological approach used (see Supplementary Materials for details).

Statistical analysis

Prevalence was presented as percentages (95% confidence interval, I2 statistic). Proportional meta-analysis was performed using double arcsine transformation [21], with results presented using random effects models (DerSimonian-Laird). Heterogeneity of meta-analysis estimates was presented using the I2 statistic. Funnel and Doi plots were used to assess the risk of publication bias [21]. Where available, differences in markers of disease activity and functional impairment were compared between groups with and without depression. Analyses were performed using MetaXL Version 5.3 (Sunrise Beach, Australia;


The searched returned a total of 1216 unique publications. After screening and full-text assessment, 27 studies met eligibility criteria. Among these, three were excluded as they used the same cohort as other included studies [22,23,24]. A flowchart of the selection process is shown in Supplementary Fig. 1.

Details extracted from the 24 included studies are shown in Table 1. Collectively they assessed the prevalence of comorbid mental health disorders in 31,227 psoriatic arthritis patients. Individual study sample sizes varied from 41 to 4795. Seventeen studies were cross-sectional in design and 7 were longitudinal (including 2 trials). PsA was defined using a number of approaches: the CASPAR criteria was used in 8 studies (only part of the population fulfilled the criteria in 2), 8 relied on physician/rheumatologist diagnosis only, 5 used ICD (International Classification of Diseases) codes, 2 used patients’ self-report and 1 used the Moll and Wright criteria.

Table 1 Summary of study characteristics, prevalence of depression and quality of studies included in this meta-analysis

According to the NOS, the quality of these studies was generally low (range 0 to 4 out of 6 possible stars). Justification of sample size and comparison of patients in/excluded from analyses were particularly lacking (Supplementary Table 1).

The most commonly studied mental health comorbidities were anxiety and depression. Ten studies used validated questionnaires to define anxiety and/or depression (6 HADS with various thresholds, 2 PHQ-9, 1 GAD-7, 1 HAM-D), 5 used components from other questionnaires (2 EQ-5D, 2 SF-36, 1 PsA-QoL), 6 used ICD codes and 5 self-report. Some studies used more than one method, but none used diagnostic criteria. Two studies reported poor sleep as screened using the Pittsburgh Sleep Quality Index (PSQI) [47, 48]; their pooled prevalence was 84% (95%CI 78 to 90%, I2 = 0%).

Prevalence of anxiety

The prevalence of anxiety ranged from 4 to 61%, depending on the HADS thresholds used. Figure 1a shows the prevalence of at least mild anxiety (HADS-A ≥ 8) as 33% (95%CI 17 to 53%, I2 = 99%) [26,27,28,29]. Figure 1b shows the pooled prevalence for at least moderate anxiety (HADS-A ≥ 11 and GAD-7 ≥ 10) as 21% (95%CI 14 to 29%, I2 = 96%) [25,26,27,28,29,30,31]; excluding the single study using GAD-7 [31] did not improve heterogeneity (data not shown). The prevalence of anxiety using ICD-9 codes was 6% (95%CI 2 to 12%, I2 = 99%) [37, 38]. There was major asymmetry in the funnel and Doi plots for both mild and moderate anxiety prevalence estimates (Supplementary Fig. 2).

Fig. 1
figure 1

Forest plots showing the pooled prevalence of anxiety in studies of PsA. The top panel (a) shows prevalence estimates for at least mild anxiety, and bottom panel (b) at least moderate

Prevalence of depression

The prevalence of depression ranged from 5 to 51%, depending on the thresholds used. The prevalence of at least mild depression (HADS-D ≥ 8, PHQ-9 ≥ 5, HAM-D ≥ 7) was 20% (95%CI 8 to 35%, I2 = 99%; Fig. 2a) [26,27,28,29, 31, 33]; keeping only studies using HADS-D did not improve heterogeneity (data not shown). The pooled prevalence of at least moderate depression (HADS-D ≥ 11, PHQ-9 ≥ 10) was 14% (95%CI 8 to 21%, I2 = 96%; Fig. 2b) [25,26,27,28,29,30, 32]; excluding the single study using PHQ-9 did not improve heterogeneity (data not shown). Three studies reported the prevalence of depression using patient self-reported diagnosis: the pooled estimate was 22% (95%CI 9 to 39%, I2 = 98%) [40,41,42]. Only two studies reported depression prevalence using ICD-9 codes: the pooled estimate was 9% (95%CI 3 to 17%, I2 = 100%) [37, 38]. There was minor asymmetry in the funnel and Doi plots for mild depression, but major asymmetry for moderate depression (Supplementary Fig. 3).

Fig. 2
figure 2

Forest plots showing the pooled prevalence of depression in studies of PsA. The top panel (a) shows prevalence estimates for at least mild depression, and bottom panel (b) at least moderate

Prevalence of anxiety and/or depression

Eight studies reported the combined prevalence of anxiety and/or depression. Figure 3a shows the pooled prevalence of anxiety or depression as 22% (95%CI 7 to 42%, I2 = 99%) [31, 34, 35, 39, 43, 44]. The prevalence using screening questionnaires was higher than studies using self-report or ICD code. Figure 3b shows the pooled prevalence of anxiety and depression as 29% (95%CI 20 to 38%, I2 = 94%) [26, 28, 30, 31]. There was no asymmetry in the funnel or Doi plots (Supplementary Fig. 4). Khraishi et al. reported a higher prevalence of these comorbidities in established than early PsA (17 vs 9.5%) [44].

Fig. 3
figure 3

The top panel (a) shows prevalence estimates for anxiety or depression, and bottom panel (b) anxiety and depression in studies of PsA

Mental health comorbidities and disease activity

Only two studies compared disease activity scores in patients with and without comorbid mental health disorders. Freire et al. found that DAS28 (3.2 vs 2.9 p < 0.05) and pain visual analogue scale (VAS) (4.1 vs 3.0 p < 0.01) were higher in patients with anxiety than those without [30]. Similarly, DAS28 and pain VAS were higher in those with depression than those without. BASDAI was only assessed in a small subgroup, thus comparisons were underpowered. Michelsen et al. compared those with and without anxiety or depression [35]. In addition to DAS28 and pain VAS, they also found differences in the tender joint count, patient and evaluators global, but not swollen joint count, ESR or CRP (Table 2).

Table 2 Results from two studies comparing psoriatic arthritis patients with and without comorbid anxiety or depression


Mental health comorbidities are common among patients with PsA. In this systematic review and meta-analysis pooling data of over 30 thousand PsA patients, 1 in 3 screened positive for at least mild anxiety, while 1 in 5 reported at least mild depression. The prevalence of at least moderate anxiety (21%) and depression (14%) was lower on screening. Patients with anxiety and/or depression reported greater disease activity, although the number of studies was small. Sleep problems were also common (84%) but other mental health comorbidities were rarely reported.

High prevalence of mental health comorbidities among people with psoriasis is well recognised. Features of PsA can be considered additional psoriatic disease burden with accompanying functional impairment. Although meta-analysis estimates for PsA and psoriasis populations cannot be directly compared, several studies have demonstrated higher burden of anxiety and depression in psoriasis patients with PsA than those without: McDonough et al. showed that at least mild anxiety and depression were more prevalent in psoriasis patients with PsA than those without (17.7 vs 6.7%) [26]. Compared with the general population, the risk of depression in people with psoriasis was 14% higher, while those with PsA was 22% higher [49]. Among females, the risk of depression was 29% higher in those with psoriasis, but 52% higher if both psoriasis and PsA were present [50].

The prevalence of depression in this meta-analysis (14–20%) is similar to those reported in other inflammatory arthritides. A meta-analysis in rheumatoid arthritis (RA) reported at least moderate depression (HADS ≥ 11) in 15% of patients and at least mild depression (HADS ≥ 8) in 34% [40]. Virtually identical findings (15% moderate, 38% mild) were reported in an axial spondyloarthritis (axSpA) meta-analysis [51]. These similarities are somewhat unexpected since the proportions of females—who have a higher risk of depression—are very different in these three rheumatic diseases. Other characteristics important for the development of mental health disorders (e.g. age or comorbidity burden) are also likely to differ. In a large case-control study using UK primary care data, the authors adjusted for these confounders and found similar adjusted risk of depression across RA (HR 1.38), AS (HR 1.36), and mild psoriasis (HR 1.30), but higher in severe psoriasis (HR 1.71) [52]. The risk of anxiety appeared higher in AS (1.44) and psoriasis (1.28–1.33) than RA (1.10). No studies examined whether PsA severity was associated with prevalence or incidence of mental health disorders.

Patients with more severe disease may be at higher risk of developing mental health comorbidities, while some mental disorders have been shown to exacerbate the perception of pain [6]. Systemic inflammation may influence neurocognitive functions [53, 54]. Only two studies compared disease activity between PsA patients with and without mental health comorbidities. Both found significantly higher DAS28 and pain VAS in those with comorbid anxiety or depression, but there were no differences in swollen joint count, ESR or CRP. These cross-sectional studies do not allow us to distinguish the direction of any causal relationship, but the absence of differences in more objective measures of inflammation suggests it is more likely that these comorbidities are influencing reporting of disease severity. Healthcare professional should be mindful of these comorbidities when making treatment decisions based on composite disease scores; screening may be considered for these comorbidities to aid their diagnosis and management. Future studies should validate existing tools, such as the HADS, in patients with inflammatory rheumatic diseases.

One important finding of this review was the paucity of studies on suicide, self-harm, sexual health, substance misuse and other important mental health–related comorbidities. More research is needed in this area, particularly given that one study suggested a higher incidence rate of “any suicidality” in PsA than the general population [49]. Two studies in this review did highlight the importance of future studies of sleep on PsA outcome measures: 84% of patients screened positive for having poor-quality sleep. Michelsen et al. also reported that comorbid depression and anxiety were negative predictors of PsA remission [35].

A key strength of this review was a large number of studies and patients included. This allowed us to compare prevalence estimated from screening questionnaires against other methods, namely ICD codes. Prevalence of anxiety (6%) and depression (9%) were much lower using ICD codes, likely due to these codes’ low sensitivity for mental health diagnoses [55, 56]. Including a range of study designs can have implications for variations in effect estimates and may contribute to the high heterogeneity observed. However, heterogeneity remained when we stratified meta-analyses by criteria.

The main limitation was the fact that no studies used validated diagnostic criteria for mental health disorders, such as the Structured Clinical Interview for Diagnostic and Statistical Manual of Mental Disorders. It is likely that screening criteria over-estimate while ICD codes under-estimate true prevalence. We also include studies that used different definitions of PsA, although it was not feasible to stratify by definitions of both PsA and mental health. This was taken into account during quality assessments. Almost all studies recruited patients from hospitals; these patients are likely to have more severe disease than a primary care sample. Finally, studies included in this review did not consider other comorbidities and PsA disease features. Fibromyalgia, metabolic syndrome and extra-articular manifestations are highly prevalent [7]; future studies should examine how these related conditions interact with mental health comorbidities and influence the management of PsA patients.


The results of this paper demonstrate that anxiety and depression are highly prevalent in psoriatic arthritis patients. Prevalence estimates are similar to those reported in RA, but some studies suggested a higher burden of anxiety and depression in psoriasis patients with PsA than those without. More research is needed on other mental health comorbidities, particularly sleep, suicide/self-harm and substance misuse. Comorbid anxiety or depression was associated with worse disease activity. Clinicians should be mindful of this when managing PsA patient. Patients with depression should be appropriately referred and managed. This is especially pertinent if depressive symptoms are thought to adversely influence assessments of treatment response.


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Correspondence to Nicola J. Goodson.

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Zhao, S.S., Miller, N., Harrison, N. et al. Systematic review of mental health comorbidities in psoriatic arthritis. Clin Rheumatol 39, 217–225 (2020).

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  • Anxiety
  • Comorbidity
  • Depression
  • Mental health
  • Meta-analysis
  • Prevalence
  • Psoriatic arthritis
  • Sleep
  • Systematic review