Central Sensitization Inventory

Abstract

The Central Sensitization Inventory (CSI) is a self-report questionnaire designed to measure the presence and severity of symptoms commonly associated with a state of central sensitization. This condition often underlies various chronic pain and complex regional syndromes, collectively referred to as Central Sensitization Syndromes (CSS). The CSI assesses both the somatic and emotional symptoms experienced by patients. The instrument is divided into two distinct parts: Part A, which quantifies symptom severity, and Part B, which identifies prior diagnoses of specific CSS conditions.

Keywords

Central Sensitization Inventory, CSI, Central Sensitization Syndrome, CSS, Chronic Pain, Somatic symptoms, Emotional distress, Pain assessment, Questionnaire, Psychometrics

Authors

van Wilgen P, Meeus M, Descheemaeker F, Cagnie B. (2013)

Purpose

The primary purpose of the Central Sensitization Inventory (CSI) is to screen for, and quantify the level of, symptoms related to central sensitization in clinical populations. Central sensitization is a hypothesized neurophysiological mechanism characterized by an increased responsiveness of nociceptive neurons in the central nervous system to normal or subthreshold afferent input, leading to hypersensitivity and chronic pain states.

By providing a quantitative score, the CSI assists clinicians in identifying patients who may benefit from treatment approaches specifically targeting central pain mechanisms, rather than solely peripheral musculoskeletal issues. This instrument is essential for differentiating between primarily peripheral and centrally driven pain syndromes in adults and the elderly.

Construct

The CSI measures the multifaceted construct of central sensitization (CS) through a combination of physical and psychological indicators. CS is understood as a state where the nervous system is amplified, leading to pain and distress disproportionate to peripheral tissue damage. The inventory specifically operationalizes this construct through two components.

Part A focuses on 25 items reflecting common somatic symptoms and emotional distress (e.g., fatigue, cognitive difficulties, mood disturbances) known to co-occur with CS. Part B addresses the history of ten specific clinical diagnoses that are classified as Central Sensitization Syndromes, such as fibromyalgia, chronic fatigue syndrome, and temporomandibular joint disorder. This two-part structure ensures both subjective symptom experience and diagnostic history contribute to the overall clinical picture.

Validity

The Central Sensitization Inventory has demonstrated strong psychometric properties across numerous validation studies, establishing its utility in clinical research. Evidence of construct validity is derived from its significant correlation with other established measures of pain-related disability, pain catastrophizing, and emotional distress. Specifically, higher CSI scores consistently correlate with greater self-reported functional limitations and increased psychosocial distress, supporting the notion that it captures the centrally mediated component of chronic pain.

Discriminant validity studies have shown that the CSI can effectively differentiate individuals with primary Central Sensitization Syndromes (like fibromyalgia) from those with localized, purely peripheral pain conditions. Furthermore, factor analytic studies generally support the scale’s theoretical foundation, linking the items strongly to both physical symptoms and associated emotional/cognitive comorbidities.

Reliability

The reliability of the CSI is consistently reported as excellent. Internal consistency, measured primarily using Cronbach’s alpha for Part A (the symptom severity scale), typically falls in the range of 0.88 to 0.93, indicating high homogeneity among the 25 items. This suggests that the items reliably measure a single underlying construct of central sensitivity.

Test-retest reliability has also been established, demonstrating the stability of the instrument over time in patients with chronic pain conditions. High intraclass correlation coefficients (ICCs) support the use of the CSI for repeated assessments, making it suitable for monitoring treatment efficacy and changes in central sensitization severity over the course of intervention.

Factor Analysis

Initial and subsequent factor analyses of the 25 items in Part A of the CSI often suggest a multi-factor structure, though the exact number of factors varies slightly depending on the population studied. Generally, these analyses reveal factors representing key symptom clusters associated with central sensitization, such as:

• Somatic Symptoms and Physical Distress (e.g., pain and bodily complaints).
• Emotional Distress (e.g., anxiety, depression, and mood changes).
• Cognitive and Memory Difficulties (e.g., concentration issues or brain fog).
• Urological/Gastrointestinal Symptoms (e.g., irritable bowel or bladder symptoms).

Despite the identification of these sub-factors, the CSI is most commonly utilized by summing the scores of the 25 items to yield a single total score (ranging from 0 to 100). This total score serves as a global indicator of the burden of central sensitization symptoms, which has proven highly effective in clinical settings.

Instrument

Test Type: Questionnaire (Self-report inventory)

Format: The CSI consists of two sections. Part A contains 25 items measuring symptom severity using a 5-point Likert scale (0 = Never, 4 = Always). Part B includes 10 items assessing the presence of previously diagnosed Central Sensitization Syndromes.

Language Available: Original development was in English, but the scale has been widely translated and validated in numerous languages, including Dutch (as referenced in the source), Spanish, German, and French.

Population Group: Clinical populations presenting with chronic pain and systemic health complaints.

Age Group: Adults and Elderly (Volwassenen, Ouderen)

Population Details: The CSI is appropriate for patients suffering from chronic musculoskeletal pain, widespread pain, or diagnosed with conditions such as fibromyalgia, chronic fatigue syndrome, or tension headaches. It is not generally intended for acute pain assessment.

Test Methodology: Patients complete the 25 items of Part A, resulting in a total score between 0 and 100. Higher scores indicate greater severity of central sensitization symptoms. Part B is used for clinical context and categorization of the patient’s history.

The original manual (Toelichtingsformulier) and the instrument itself (Meetinstrument) can be accessed via the provided PDF links. The original PDF explaining the scale’s use can be downloaded here: Toelichtingsformulier PDF. The original PDF of the measurement instrument can be downloaded here: Meetinstrument PDF.

Keywords

Central Pain, Fibromyalgia, Chronic Fatigue Syndrome, Psychometrics, Somatization, Pain Catastrophizing, Disability, Validation Study, Self-Report

Authors

Author ORCID Identifier: N/A (Information not provided in source)

Affiliation Email addresses: N/A (Information not provided in source)

Correspondence Address: N/A (Information not provided in source)

Permissions & Fee and Test Year

The Central Sensitization Inventory was developed in its original form by Neblett et al. in 2011, with the specific validation or adaptation cited here authored by van Wilgen P, Meeus M, Descheemaeker F, and Cagnie B in 2013. The CSI is often available for use in clinical and research settings, though specific licensing agreements may be required depending on the version and language utilized.

Researchers and clinicians should consult the official scale distributors or the primary authors for the most current information regarding usage fees and formal permissions required for reproduction or electronic administration. While the scale is widely adopted, proprietary rights may apply to specific validated translations or electronic implementations.

Reference’s

van Wilgen P, Meeus M, Descheemaeker F, Cagnie B. (2013). Reference information for the Dutch adaptation of the Central Sensitization Inventory. (Specific publication details for the 2013 adaptation require external source verification.)

Neblett, R., Cohen, H., Choi, Y., Hartzell, M. M., Williams, M., Mayer, T. G., & Gatchel, R. J. (2011). The Central Sensitization Inventory (CSI): establishing clinically significant cutoff scores for identification of central sensitization-related symptoms in patients with chronic pain. The Journal of Pain, 12(11), 1060-1068.

Items of the Central Sensitization Inventory

IMPORTANT: The following scale items must be preserved in their original language and must not be changed in any way.

The specific items of the Central Sensitization Inventory (CSI) Part A (the 25 symptoms) and Part B (the 10 diagnoses) are not provided in the source content. Access to the full list of proprietary items requires consultation of the official measurement instrument document or manual.