By Matt Harrington, BCBA · Behaviorist Book Club · April 2026 · 12 min read

Pain Science, Differential Diagnosis, and Behavior Analysis: Clinical Principles from the Vulvodynia Nerve Involvement Literature

Overview & Clinical Significance

Stephanie Prendergast's presentation on vulvodynia and the differential diagnosis of nerve involvement, delivered at the 2024 Pelvicon Vulvodynia Symposium, addresses a specialized area of pelvic health medicine that is well outside the traditional scope of applied behavior analysis. However, as the course learning objectives acknowledge, the principles discussed carry relevance to current behavior-analytic practice through the overlapping frameworks of pain behavior, biopsychosocial assessment, and the clinical implications of differential diagnosis methodology.

Behavior analysis has increasingly engaged with health psychology, behavioral medicine, and pain science through the growing literature on acceptance and commitment therapy (ACT), chronic pain intervention, and behavioral approaches to health behavior change. Behavior analysts working in medical, rehabilitation, or chronic illness settings encounter clients whose behavioral presentations are shaped by pain and sensory experience in ways that require an understanding of the underlying physiological processes—even when behavior analysts are not diagnosing or treating those processes directly.

The differential diagnosis framework that Prendergast applies to vulvodynia—distinguishing peripheral nerve involvement from central sensitization, musculoskeletal contributions, and inflammatory processes—reflects a broader clinical methodology of systematic hypothesis generation and testing that has direct parallels in behavior-analytic assessment. Understanding how clinicians in other disciplines think about complex, multifactorial presentations enriches the behavior analyst's capacity to contribute to interdisciplinary teams and to understand the medical context of clients they serve.

Background & Context

Vulvodynia is a chronic vulvar pain condition affecting a significant percentage of women across their lifespan, characterized by persistent pain at the vulvar vestibule, perineum, or broader vulvar region in the absence of an identifiable infection or skin disorder explaining the pain. The condition is frequently underdiagnosed and undertreated due to limited clinician training in pelvic health and the absence of visible physical findings on standard examination.

The differential diagnosis of nerve involvement in vulvodynia distinguishes between several overlapping etiologies: provoked vestibulodynia related to peripheral sensitization of vestibular nerve endings, pudendal neuralgia involving entrapment or irritation of the pudendal nerve, central sensitization syndromes in which the central nervous system's pain processing is altered, and contributions from pelvic floor musculature hypertonicity that can mechanically irritate neurological structures. Stephanie Prendergast, a physical therapist specializing in pelvic health, presents a framework for systematically evaluating the relative contribution of these mechanisms in individual patients.

For behavior analysts, the clinical relevance of this content operates on several levels. First, pain is a private event with behavioral manifestations that behavior analysts in clinical settings observe and sometimes address. Understanding the mechanistic underpinnings of chronic pain conditions helps behavior analysts recognize when behavioral presentations are physiologically driven and require medical referral rather than behavioral intervention. Second, the interdisciplinary context in which pelvic health conditions are treated—involving physicians, pelvic physical therapists, psychologists, and in some cases behavior analysts—requires enough cross-disciplinary literacy to participate meaningfully in collaborative care.

Clinical Implications

The clinical implications of Prendergast's content for behavior analysts are primarily translational—applying frameworks from an adjacent clinical domain to sharpen behavior-analytic thinking about complex presentations involving pain, sensory aversion, and health-related behavior.

First, the differential diagnosis framework itself has direct parallel in functional behavior assessment. Just as a pelvic health clinician generates competing hypotheses about the mechanism of pain—peripheral nerve involvement versus central sensitization versus musculoskeletal—and systematically evaluates evidence for each, a behavior analyst conducting a functional assessment generates competing hypotheses about behavioral function and tests them systematically. The intellectual structure is identical even though the content differs.

Second, the concept of peripheral and central sensitization in pain science has conceptual overlap with behavioral phenomena relevant to ABA practice. Central sensitization—in which the nervous system's pain response is amplified beyond the level warranted by peripheral tissue damage—has analogies in behavioral excess driven by conditioned emotional responses and rule-governed behavior that maintains aversive responding in the absence of current aversive stimulation. Clients with trauma histories, anxiety disorders, or chronic health conditions may present with behavioral profiles that require understanding these neurological underpinnings.

Third, for behavior analysts working in women's health, pediatric gynecology, or chronic illness settings, the specific content about vulvodynia and nerve involvement differential diagnosis provides directly applicable clinical knowledge. Behavioral interventions for pain-related avoidance, treatment adherence, and sexual health functioning are areas where behavior analysts increasingly practice, and clinical competence in those areas requires familiarity with the underlying medical literature.

Ethical Considerations

Code 1.05 (Practicing within One's Competence) requires behavior analysts to practice within their areas of competence. The content of Prendergast's presentation is specialized medical and physical therapy knowledge. BCBAs who engage with this content should be clear about the limits of their competence: behavior analysts can understand the principles discussed, apply them in the translational ways described above, and contribute to interdisciplinary teams—but they should not be diagnosing or directly treating pelvic floor dysfunction, neuropathic pain conditions, or nerve injuries.

Code 2.03 (Accepting Clients) requires that behavior analysts only accept clients and clinical assignments within their competence. When a behavior analyst is referred a client whose presenting concerns involve chronic pain, pelvic health, or sexual health functioning, the clinician must honestly assess whether they have the clinical background to serve this client well—and seek supervision from colleagues with appropriate expertise or make appropriate referrals when they do not.

Code 2.01 (Providing Effective Treatment) requires referral to other professionals when the presenting concerns require expertise beyond behavior analysis. The learning objectives of this course explicitly note the importance of understanding how topics from adjacent disciplines relate to current behavior-analytic practice and professional development. This framing acknowledges that intellectual engagement with other clinical domains is valuable while not implying that behavior analysts can independently address all conditions they may encounter.

The interdisciplinary setting in which pelvic health conditions are treated provides a model for ethical collaboration. Behavior analysts in medical and rehabilitation settings who understand enough about the medical context of their clients to contribute meaningfully to team discussions—while remaining clear about the boundaries of their own scope—exemplify the collaborative ethics the code calls for.

Assessment & Decision-Making

For behavior analysts working in settings where clients present with pain-related behavioral concerns—avoidance of medical procedures, health behavior non-adherence, chronic illness adjustment, or pediatric pain management—the differential diagnosis framework Prendergast presents offers a useful methodological model for thinking about complex, multi-factorial behavioral presentations.

When a client's behavior is potentially influenced by pain or sensory discomfort, the behavior analyst's assessment should systematically address several questions: Is the behavior occurring in contexts associated with pain or sensory aversion? Does the topography of the behavior suggest escape or avoidance of painful stimulation? Has the underlying medical condition been adequately assessed and treated? Are pain behaviors being inadvertently maintained by social consequences? Is the client's behavior consistent with central sensitization—responding aversively to stimuli that are not objectively harmful—or with accurate reporting of genuine aversive experience?

These questions require collaboration with medical providers. A behavior analyst who attempts to conduct a functional analysis of pain-related behavior without access to medical assessment data is operating with incomplete information that limits the validity of the functional assessment. Building referral relationships with physicians, physical therapists, and pain specialists who work with your clinical population is a prerequisite for competent assessment in medically complex cases.

Decision-making about intervention should proceed only after the medical picture is clarified. Behavioral interventions for pain-related avoidance—graduated exposure, acceptance-based approaches, functional communication training—are appropriate only when the behavior analyst understands the medical context well enough to know that the avoidance is not protective, that behavioral intervention is the appropriate primary or adjunctive treatment, and that it has been coordinated with the client's medical providers.

What This Means for Your Practice

The Pelvicon Vulvodynia Symposium content represents an opportunity to broaden your clinical perspective by engaging with how experts in an adjacent field think about complex, chronic, and often poorly understood conditions. The most direct application is methodological: the systematic differential diagnosis approach Prendergast demonstrates—generating competing mechanistic hypotheses and gathering evidence to evaluate their relative contribution—is good clinical reasoning that applies across disciplines.

For behavior analysts whose caseloads include clients with chronic pain, sensory processing differences, pelvic floor dysfunction, or related health conditions, this content provides context that enriches your understanding of the medical landscape those clients navigate. Even if your behavioral intervention does not address the physiological mechanisms directly, understanding them helps you communicate more credibly with medical colleagues, explain behavioral recommendations in terms that make sense to medical providers, and avoid behavioral formulations that inadvertently dismiss the reality of physiological contributors to behavioral presentations.

For those newer to interdisciplinary collaboration, this kind of content exposure—engaging with clinical presentations and frameworks from outside your primary training—is an important part of professional development. The field of behavior analysis has expanded significantly into health, rehabilitation, and chronic illness contexts. Practitioners in these settings benefit from cross-disciplinary literacy that allows them to be effective members of interdisciplinary teams.

Finally, consider this content through the lens of the scientist-practitioner model. The best clinicians across all disciplines share a commitment to systematic hypothesis generation, differential diagnosis thinking, and evidence-based decision-making. Engaging with how other expert clinicians apply these principles broadens the behavior analyst's methodological toolkit even when the specific content sits outside direct ABA application.