Somatic Symptom Disorder (SSD) is a psychiatric disorder characterized by an excessive focus on bodily symptoms, evaluating these symptoms as serious and threatening, and consequently experiencing anxiety, behavioral changes, and functional impairment. With the publication of the DSM-5, this concept was introduced to replace certain diagnoses that had previously been classified under “somatoform disorders.” SSD is defined not only by the presence of physical complaints, but also by the intensity of the cognitive and emotional responses given to these complaints.
This disorder, which is quite common in the general population, is frequently observed both in primary care services and in specialist clinics; it reduces quality of life and increases the utilization of health services.
Somatic Symptom Disorder DSM-5 Diagnostic Criteria
According to the American Psychiatric Association’s DSM-5 manual, the following core criteria must be met to diagnose Somatic Symptom Disorder:
- The individual has one or more somatic symptoms that are distressing or result in significant disruption of daily life.
- At least one of the following features must be present in thoughts, feelings, or behaviors related to these symptoms:
- Excessive and persistent thoughts about the seriousness of the symptoms,
- Persistently high levels of anxiety about health,
- Excessive time and energy devoted to these symptoms or health concerns.
- The symptomatic state is persistent (typically longer than 6 months), although any one symptom does not have to be continuously present.
These criteria apply both to individuals with an identifiable medical illness and to those with somatic complaints that are unexplained. In the diagnostic process, the determining factor is the degree of the psychological impact of the symptoms on the individual.
Symptoms of Somatic Symptom Disorder
Somatic Symptom Disorder may present in different clinical forms. The most commonly encountered symptoms include:
- Frequently recurring pain (head, back, stomach, etc.)
- Feelings of fatigue and exhaustion
- Gastrointestinal complaints (bloating, constipation, nausea)
- Cardiovascular complaints (palpitations, chest pain)
- Neurological symptoms (dizziness, feeling faint)
These physical complaints are often accompanied by prominent health anxiety. Despite physicians’ explanations that “no organic cause has been found,” the individual may believe that they have a serious illness. Consulting different physicians, undergoing repeated medical tests, and reassurance-seeking are common behaviors. Depressive (sadness, hopelessness) and anxious (restlessness, tension) symptoms may also co-occur.
Causes (Etiology) of Somatic Symptom Disorder
The causes of SSD are multifaceted and can be explained through a biopsychosocial framework:
1. Biological Factors
- Genetic predisposition is an important risk factor.
- Functional differences have been observed in brain regions responsible for pain and emotional processing (particularly the insula and anterior cingulate cortex).
- Heightened sensitivity in the autonomic nervous system and dysregulation in the HPA (hypothalamic–pituitary–adrenal) axis have been reported (Kroenke et al., 2011).
2. Psychological Factors
- A tendency to interpret minor bodily sensations as signs of serious illness (catastrophizing),
- Coping patterns learned in childhood (e.g., receiving attention through illness),
- A history of depression, anxiety, or trauma,
- Low tolerance for stress.
3. Social Factors
- A family history of chronic illness or an overly protective parenting style,
- Easy access to the health care system and frequent hospital visits becoming reinforcing,
- Using illness behavior to avoid responsibilities in work or social life (secondary gain).
Risk Factors for Somatic Symptom Disorder
- Female sex
- Low educational level and socioeconomic status
- Traumatic life events (especially childhood abuse)
- A family history of psychiatric disorders
- Comorbid anxiety or depression
- Personality traits (high neuroticism, histrionic tendencies)
These factors may increase the likelihood that symptoms will emerge. In particular, adverse experiences in childhood may lay the groundwork for the development of SSD later in life.
How Is It Diagnosed?
The most critical element in the diagnostic process is not whether there is a medical explanation for the symptoms, but rather how the individual perceives these symptoms. The evaluation is conducted by obtaining a detailed psychiatric history and performing a systematic assessment in line with DSM-5 criteria.
Conditions that should be considered in differential diagnosis include:
- True organic diseases (medical conditions that may explain bodily symptoms)
- Anxiety disorders (especially illness anxiety disorder)
- Major depressive disorder
- Somatization disorder (a prior DSM-IV diagnosis)
- Conversion disorder
In the diagnostic process, psychometric scales such as PHQ-15 and SSD-12 may be used. Biological testing should be conducted only when necessary, and unnecessary investigations should be avoided.
Treatment of Somatic Symptom Disorder
A comprehensive approach should be adopted in the treatment of Somatic Symptom Disorder. The goal is not to eliminate symptoms completely, but to enable the individual to maintain a functional life despite the symptoms.
1. Psychotherapy (Primary Approach)
- Cognitive Behavioral Therapy (CBT): It is one of the most effective treatment methods. The aim is for the individual to question catastrophizing thoughts, reduce avoidance behaviors, and restructure body perception. According to meta-analyses, CBT yields significant reductions in symptom severity and health anxiety (Henningsen et al., 2018).
- Mindfulness-Based Approaches: They help regulate the individual’s relationship with their body by enhancing emotional awareness.
2. Psychoeducation
- Providing the patient with information about the disorder,
- Explaining the connection between physical symptoms and stress,
- Teaching how to establish a more functional relationship with the health care system.
3. Pharmacotherapy
- Antidepressants (especially SSRIs): They may alleviate comorbid depression or anxiety symptoms. They may also have indirect positive effects on somatic symptoms.
- Anxiolytics: They should be used for a limited duration and with caution. Dependence potential should be considered.
Medication alone is not sufficient; it yields effective outcomes when implemented together with psychotherapy.
4. Multidisciplinary Approach
- Specialists such as psychiatrists, family physicians, psychologists, and physiotherapists should collaborate.
- Unnecessary tests and referrals should be avoided, and a “single physician–single plan” approach should be adopted.
Effects on Daily Life
SSD may significantly reduce an individual’s quality of life. It may lead to outcomes such as loss of work capacity, impaired social relationships, frequent visits to health institutions, and inability to fulfill household responsibilities. In addition, increased risks of depression, panic disorder, substance use, and suicide may be observed in these individuals.
Excessive burden on the health care system, increased costs, and difficulties in the physician–patient relationship are among the societal impacts of this disorder. Therefore, early diagnosis and effective intervention are important not only at the individual level but also socially.
Somatic Symptom Disorder is a mental disorder that develops through the interaction of biological and psychosocial factors, can severely affect quality of life, yet can be managed with appropriate treatment. In the diagnostic process, the possibility of organic disease should be carefully evaluated. With psychotherapy-based, multidisciplinary, and individualized treatment methods, meaningful improvements in symptoms may be achieved.