Somatization: a critical review of conceptual and methodological issues

Differentiation of somatizing patients in primary care: why the effects of treatment are always moderate

The heterogeneity of somatizing patients influences outcomes, especially in unselected samples in primary care. A cluster analysis was performed as secondary analysis on an existing data set of 127 somatizing patients included in a randomized controlled clinical trial. Anxiety and depression (HADS), number and intensity of physical symptoms (SOMS), physical and emotional functioning (short form of the SF-36 Health Survey), health beliefs (KKU-G), and psychological distress (General Health Questionnaire) were used for clustering. Outcome, treatment satisfaction, and diagnosis were calculated and compared for the clusters. We differentiated three groups from this analysis: one with elevated emotional and physical stress, one in which emotional stress dominated, and one with low emotional and physical stress. The three groups did not differ in diagnoses of somatoform disorders. The high-stress groups improved over time, whereas the depression and emotional-functioning scores in the low-stress group deteriorated. All patients were satisfied with the treatment provided. Deterioration in the scores of the low-stress group may be a result of a clinically valuable change process, in that patients who were initially in denial were able to open up and admit their problems. The increased satisfaction with treatment supports this interpretation. This so-called response shift must be taken into account in the planning of studies.

Somatization and alexithymia in young adult Finnish population

BACKGROUND

We assessed alexithymia and alexithymic features among young adult subjects with and without somatization symptoms in an epidemiological setting with a sample of young adults.

METHODS

The sample consisted of urban 31-year-old subjects (N=1002). Data on somatization were gathered from a review of all public health outpatient records. Subjects with four or more somatization symptoms according to the DSM-III-R criteria were considered somatizers. The 20-item version of the Toronto Alexithymia Scale (TAS-20) was used to measure alexithymia. Subjects with a total TAS score over 60 were considered as being alexithymic, and those with a score under 52 were considered nonalexithymic. Subjects with a total TAS score from 52 to 60 were considered as having alexithymic features.

RESULTS

The prevalence of alexithymia was 6.0% among somatizers and 4.8% among subjects without somatization symptoms, and the prevalence of alexithymic features was 7.5% and 12.6%, respectively.

CONCLUSIONS

No association was found between alexithymia and somatization in young adult general population. The earlier theory of the association between alexithymia and somatization may be questionable.

Somatization, heartsink patients, or functional somatic symptoms? Towards a clinical useful classification in primary health care

Several definitions of somatization exist and try to deal with the fundamental problem that a large group of patients present with physical symptoms for which a conventional pathology cannot be identified. However, the concept remains somewhat confusing. The prevalence of somatization is high in general practice. Nevertheless, patients do not receive proper treatment and risk iatrogenic somatic fixation and harm, the doctor-patient relationship is often negatively affected and the overall healthcare system suffers from high expenditure on unnecessary physical investigations and treatments. During the last decade research has shown that somatization may be treated effectively in specialist care. Little is known about effective treatment in primary care but the Reattribution Model and the Extended Reattribution and Management Model have shown promising results. The development and evaluation of new treatment strategies is, however, hampered by the confusion of definitions and concepts. In this article an overview is presented of the various concepts relevant to the clinical work and research in primary health care. It is important to realize that somatizing patients in primary health care present a broader spectrum of severity than patients seen in a specialist setting. Hence, primary care cannot apply definitions from specialist care directly but needs a definition that also includes the mild cases. We need classifications and agreed definitions applicable in primary health care in order to develop appropriate management strategies, to predict prognosis, and to enable rigorous research concerning the large group of somatizing patients in primary health care.

Somatization revisited: diagnosis and perceived causes of common mental disorders

The assessment of somatoform disorders is complicated by persistent theoretical and practical questions of classification and assessment. Critical rethinking of professional concepts of somatization suggests the value of complementary assessment of patients' illness explanatory models of somatoform and other common mental disorders. We undertook this prospective study to assess medically unexplained somatic symptoms and their patient-perceived causes of illness and to show how patients' explanatory models relate to professional diagnoses of common mental disorders and how they may predict the short-term course of illness. Tertiary care patients (N=186) with prominent somatoform symptoms were evaluated with the Structured Clinical Interview for DSM-IV, a locally adapted Explanatory Model Interview to elicit patients' illness experience (priority symptoms) and perceived causes, and clinical self-report questionnaires. The self-report questionnaires were administered at baseline and after 6 months. Diagnostic overlap between somatoform, depressive, and anxiety disorders occurred frequently (79.6%). Patients explained pure somatoform disorders mainly with organic causal attributions; they explained pure depressive and/or anxiety disorders mainly with psychosocial perceived causes, and patients in the diagnostic overlap group typically reported mixed causal attributions. In this last group, among patients with similar levels of symptom severity, organic perceived causes were related to a lower physical health sum score on the MOS Short Form, and psychosocial perceived causes were related to less severe depressive symptoms, assessed with the Hospital Anxiety and Depression Scale at 6 months. Among patients meeting criteria for comorbid somatoform with anxiety and/or depressive disorders, complementary assessment of patient-perceived causes, a key element of illness explanatory models, was related to levels of functional impairment and short-term prognosis. For such patients, causal attributions may be particularly useful to clarify clinically significant features of common mental disorders and thereby contribute to clinical assessment.

Somatized depression in primary care attenders

OBJECTIVE

The aim of this study is to determine, within the context of primary care, the frequency of the various ways in which depression is presented with respect to somatic symptoms and to compare depressed patients who present their distress somatically with those with psychological complaints.

METHOD

In the two-phase cross-sectional study, first, we screened 906 consecutive patients, and second, we interviewed in detail 306 selected patients.

RESULTS

The prevalence of depression was 16.8% (CI 95%: 13.4-20.2). There were 59 cases with psychological presentation, 45 somatizers and 16 had organic disorders with depressive comorbidity. Somatizers had lower level of education, and somatized depression was less serious and caused less repercussion. Detection, antidepressive treatment and psychiatric care were lower for somatizers than for psychologizers.

CONCLUSIONS

Somatization is a frequent way to present depression in primary care. For somatizers, depression is less severe and is associated with less repercussion. Somatization is associated with the under-detection of the underlying psychiatric process.

Detection of somatization and depression in primary care in Saudi Arabia

BACKGROUND

Studies have shown a high worldwide prevalence of mental disorders in primary care. Many patients present with unexplained physical symptoms rather than psychological complaints, resulting in an excess number of costly clinical investigations. This study investigates the ability of primary care physicians to correctly detect and diagnose somatization and depression in Saudi Arabian patients.

METHODS

In all 431 primary care patients in Riyadh Saudi Arabia were screened for somatization and depression using the Patient Health Questionnaire (PHQ). Primary care physicians independently assessed these same patients while blinded to the results of the PHQ. Agreement between physician observations and the screening instrument was examined.

RESULTS

Using the PHQ as the standard of comparison for measuring the detection rates of Saudi physicians, the agreement between and the PHQ and physician assessments was kappa = 0.40 for depression (0.45 females, 0.31 males) and kappa = 0.27 for somatization (0.36 females, 0.12 males). Physicians assessed higher rates of somatization than indicated by the screening instrument and demonstrated poor diagnostic agreement on somatization and depression, particularly for male patients.

CONCLUSIONS

Saudi primary care physicians have awareness of psychiatric disorders, but their diagnostic skills are poor for somatization and depression. Psychiatric training should be supported in the continuing education of primary care physicians and patients should be encouraged to report psychological complaints to family physicians. A simple screening instrument for identifying mental disorders in developing countries is a valuable tool for assessment in primary care.

Is somatization a significant depressive symptom in older Taiwanese Americans?

Adapting to psychosocial and physical changes can trigger nonspecific somatic complaints and depression. Somatization has been noted in all societies and cultures; however, it is more frequently observed in Asian populations. This study used the Geriatric Depression Scale (GDS) to screen 100 Taiwanese American older adults for depressive symptoms and found that seven participants (7%) experienced depressive symptoms (GDS >/= 14). Although the mean number of illnesses reported was significantly higher (t = -16.8, P <.001) in the depressive group, the seven individuals did not focus on physical symptoms during interview. They reported guilt, sadness, anger, resentment, loneliness, helplessness, hopelessness, inability to enjoy activities, and anhedonia. If older adults are given the time to express themselves, they are able to reveal their emotional pain and distress rather than remain preoccupied with somatic complaints. A simple depression screening tool, such as the GDS, can help detect depression.

Self-reported stress reactivity and psoriasis-related stress of Nordic psoriasis sufferers

OBJECTIVES

The purpose of the study was to investigate the perceived influence of stress on psoriasis onset and disease severity in a large sample of psoriatics and to compare stress reactors and non-reactors with respect to psoriasis-related stress, disease severity, family history of psoriasis and sociodemographic factors.

PATIENTS/METHODS

A total of 5795 members of the Nordic psoriasis associations and 702 patients recruited from Nordic dermatologists or university clinics were asked whether their first outbreak of psoriasis occurred during times of worry and stress. They were also asked to rate the degree to which their psoriasis was influenced by stress and to complete the Psoriasis Life Stress Index, the Psoriasis Disability Index and a number of additional questions concerning sociodemographic factors.

RESULTS

Seventy-one per cent of the members and 66% of the patients reported that their psoriasis was exacerbated by stress, and 35% in both groups reported that the onset of their psoriasis occurred during a time of worry and stress. Stress reactors, scoring above the median on stress reactivity, reported greater disease severity, psoriasis-related stress and impairment of disease-related quality of life. They also reported more frequent use of tobacco, tranquillizers and antidepressants. More women than men were stress reactors, and stress reactors were more likely to have a family history of psoriasis.

CONCLUSION

Our findings confirm and extend the results of previous studies and indicate that a subgroup of psoriatics may be more psychologically reactive to their disease and its influence on everyday life. Whether this group is also physiologically more reactive to psychosocial stress remains to be investigated.

Somatoform disorders: a help or hindrance to good patient care?

The paper by de Waal and colleagues (2004, this issue) reports on the prevalence of somatoform disorders in Dutch primary care. They found that at least one out of six patients seen by general practitioners could be regarded as having a somatoform disorder, almost all in the non-specific category of undifferentiated somatoform disorder. The prevalence of the condition has major implications for medical services but what does this diagnosis mean? Is receiving a diagnosis of somatoform disorder of any benefit to the patient? Does it help the doctor to provide treatment?

A systematic review of the epidemiology of somatisation disorder and hypochondriasis

BACKGROUND

This paper reviews current knowledge regarding the prevalence and associated features of somatisation disorder and hypochondriasis in population-based and primary care samples.

METHOD

A systematic review of the literature, which used a standardised definition of somatisation disorder or hypochondriasis and which examined the characteristics and associated features of these disorders in population-based samples or primary care settings.

RESULTS

In population-based studies the prevalence of somatisation disorder and hypochondriasis was too low to examine associated features reliably. In studies using abridged criteria, a clear female predominance was not found in either disorder; there was a consistent relationship with few years of education. There was a close relationship with anxiety and depressive disorders, with a linear relationship between numbers of somatic and other symptoms of distress in several studies, including longitudinal studies. No studies showed that these symptom clusters fulfil the criteria of characteristic onset, course and prognosis required to merit the status of discrete psychiatric disorders.

CONCLUSIONS

On existing evidence, somatisation disorder and hypochondriasis cannot be regarded as definite psychiatric disorders. There is some evidence that numerous somatic symptoms or illness worry may be associated with impairment and high health care utilisation in a way that cannot be solely explained by concurrent anxiety and depression, but further research using population-based samples is required.

Personality and affect as determinants of medically unexplained symptoms in primary care; A follow-up study

OBJECTIVE

To examine whether the personality dimensions, neuroticism and alexithymia, and the affective state dimensions measuring negative and positive affect significantly contributed to changes over time in the number of medically unexplained symptoms (MUS) reported.

METHODS

A total of 318 patients, presenting to their primary care physician with MUS, participated in the study. Logistic regression analyses were conducted to assess to what extent neuroticism, alexithymia, negative affect and positive affect independently contributed to (1) increase vs. decrease in the number of symptoms reported, and (2) the presence of a consistently high number of MUS over a 6-month follow-up period.

RESULTS

Negative affect was the strongest determinant of changes in the number of symptoms reported. In addition, low positive affect significantly contributed to changes in the number of symptoms over time. Next to negative affect, the dimension of alexithymia measuring difficulty in identifying feelings (DIF) was found to be an independent predictor of a consistently high number of MUS. Neither neuroticism nor general alexithymia independently contributed to changes in the number of symptoms over time or to symptom persistence.

CONCLUSIONS

Negative affect is an important determinant of MUS, because it contributes both to symptom evolution and symptom persistence. Positive affect has a beneficial effect on somatic symptom evolution, whereas the alexithymia dimension measuring DIF clearly contributes to the prediction of symptom persistence.

Neuroticism, alexithymia, negative affect and positive affect as predictors of medically unexplained symptoms in primary care

BACKGROUND

Somatization has been defined in a number of ways. Despite their differences, these definitions have one element in common, namely the presence of somatic symptoms that cannot be explained (adequately) by organic findings.

OBJECTIVE

The primary objectives of the dissertation were to gain a better insight into the concept of somatization, and to study (prospectively) the relationship between neuroticism and alexithymia, two personality traits that have been shown to be related to somatization, the affective state dimensions positive and negative affect (or psychological distress) and medically unexplained symptoms.

METHOD

A selective review was conducted regarding conceptual and methodological issues related to somatization. A total number of 318 patients, presenting to their primary care physician with medically unexplained symptoms, participated in the prospective study. Both at baseline and at 6-month follow-up a number of measures were filled out with respect to somatization, neuroticism, alexithymia, negative and positive affect, anxiety and depression.

RESULTS

The concept of somatization was clarified, thereby making use of the distinction between presenting and functional somatization. The personality traits neuroticism and alexithymia were found to have an indirect influence on symptom reports. Both the cross-sectional and follow-up data pointed to the importance of positive and negative affect as determinants of (changes in) number of symptoms (over time). Negative affect, together with the alexithymia dimension measuring difficulty identifying feelings, predicted symptom persistence.

CONCLUSIONS

The theoretical as well as therapeutic implications of the present paper may give an impetus to new research in the domain of somatization.