Endometriosis, Pelvic Pain, and Interpretation Bias

When Ambiguous Symptoms Are Seen as Threats: A New Perspective on Pelvic Pain

Key Points

Highlights:

• A new Pelvic Pain Bias Assessment (PPBA) was developed and validated to measure pelvic pain–specific interpretation bias.
• Stronger interpretation bias was associated with more severe pelvic pain and menstrual symptoms across pelvic pain conditions.

Importance:

• Stronger threat-oriented interpretations of ambiguous bodily symptoms are associated with worse pelvic pain and menstrual symptom burden, suggesting that cognitive processes may contribute to symptom experiences across pelvic pain conditions.

What's Done Here?

• This is a cross-sectional psychometric validation study involving 342 individuals with endometriosis (n=81), adenomyosis (n=33), chronic pelvic pain (n=62), PCOS (n=55), and controls without pelvic pain conditions (n=148).
• A novel Pelvic Pain Bias Assessment (PPBA) was developed and validated.
• Associations of PPBA with pelvic pain, menstrual symptoms, pain catastrophizing, and psychological distress were evaluated.

Key Results:

• Following rigorous item selection, 27 pelvic pain–specific scenarios were retained to form the PPBA.
• Interpretation bias was significantly higher in individuals with endometriosis than in controls.
• Interpretation bias was also elevated in individuals with other pelvic pain–related conditions compared with controls.
• Stronger interpretation bias was associated with greater pelvic pain severity, menstrual symptom burden, pain catastrophizing, and psychological distress.
• The PPBA demonstrated excellent internal consistency, test–retest reliability, and construct validity.

Strengths and Limitations:

• Strengths are the development and validation of the first pelvic pain–specific interpretation bias assessment tool and evaluation across multiple pelvic pain conditions using psychometrically rigorous methods.
• Limitations are the cross-sectional design, self-reported diagnoses, substantial comorbidity between conditions, and recruitment through social media, which may limit generalizability.

From the Editor-in-Chief – EndoNews

"Pelvic pain has traditionally been evaluated through the lens of underlying pathology, yet symptom severity often exceeds what anatomical findings alone can explain. This study is particularly interesting because it shifts the discussion from how much disease is present to how symptoms are interpreted. Rather than focusing solely on the disease itself, the findings suggest that threat-oriented interpretations of ambiguous bodily sensations may be associated with pain-related suffering across a range of pelvic pain conditions.

Importantly, these observations should not be interpreted as diminishing the biological basis of pelvic pain. Instead, they support an increasingly recognized view that pain emerges from complex interactions among biological, cognitive, and emotional processes. Within this framework, interpretation bias may influence how symptoms are perceived and experienced, potentially contributing to differences in symptom burden among individuals with otherwise similar clinical conditions.

Although the cross-sectional design precludes conclusions regarding causality, the study contributes meaningfully to contemporary models of chronic pain. By introducing a condition-specific assessment tool and demonstrating consistent associations between interpretation bias and symptom severity, it provides a foundation for future research exploring how cognitive processes interact with disease-related mechanisms in endometriosis and other pelvic pain disorders."

Lay Summary

How people interpret ambiguous bodily symptoms may influence the severity of pelvic pain and menstrual symptoms, according to a new study published in the scientific journal PAIN.

The study found that women with endometriosis and other pelvic pain conditions were more likely to interpret uncertain or ambiguous bodily sensations as threatening or pain-related, a cognitive pattern known as interpretation bias. Stronger interpretation bias was associated with worse pelvic pain, more severe menstrual symptoms, and greater psychological distress.To better understand this relationship, a team led by Dr. Jemma Todd  from the School of Psychology, Clinical Psychology Unit, Brain and Mind Center of University of Western Australia, developed and validated a new tool called the Pelvic Pain Bias Assessment (PPBA). The study included 342 individuals with endometriosis, adenomyosis, chronic pelvic pain, PCOS, and controls without pelvic pain conditions.

The researchers created a series of ambiguous pelvic pain–related scenarios and assessed how participants interpreted them. Following a rigorous validation process, 27 scenarios were retained to form the final PPBA. The tool demonstrated excellent reliability and validity for measuring pelvic pain–specific interpretation bias.

Women with endometriosis showed significantly stronger interpretation bias than controls. Similar patterns were also observed among participants with other pelvic pain–related conditions. Across the study population, stronger interpretation bias was associated with greater pelvic pain severity, more severe menstrual symptoms, higher pain catastrophizing, and poorer psychological well-being.

The findings suggest that cognitive processes may play an important role in how pelvic pain is experienced and maintained. The authors propose that interpretation bias may represent a potentially modifiable target for future multidisciplinary pain-management approaches in endometriosis and other pelvic pain disorders.

Research Source: https://pubmed.ncbi.nlm.nih.gov/41325556/