What Are Chronic Overlapping Pain Conditions?

Research shows that people with interstitial cystitis/bladder pain syndrome (IC/BPS) are more likely to develop other chronic pain conditions. The National Institutes of Health uses the term chronic overlapping pain conditions (COPCs) to describe disorders that frequently co-occur and may share underlying causes, particularly central sensitization, a process in which the nervous system amplifies pain signals. Recognizing these connections can help you and your care team develop a more comprehensive treatment approach.

Endometriosis occurs when tissue similar to the uterine lining grows outside the uterus, causing chronic pelvic pain, painful periods, pain with intercourse, and infertility. It affects roughly 10% of reproductive-age women. Because the bladder and reproductive organs share pelvic nerve pathways, many patients meet criteria for both endometriosis and IC/BPS. If you have one condition, discuss screening for the other with your provider.

Learn More: Endometriosis Foundation of America

Fibromyalgia is characterized by widespread musculoskeletal pain, fatigue, sleep disturbances, and cognitive difficulties. It affects 2–4% of the population, predominantly women. Like IC/BPS, fibromyalgia involves abnormal central pain processing. The NIH-funded MAPP Research Network has found that IC/BPS patients with concurrent fibromyalgia tend to experience more severe symptoms. Treatments targeting central sensitization, such as certain medications, cognitive behavioral therapy, and exercise, may benefit both conditions.

Learn More: National Fibromyalgia Association

Irritable bowel syndrome (IBS) is a functional gastrointestinal disorder characterized by recurrent abdominal pain associated with changes in bowel habits: diarrhea, constipation, or both. It affects an estimated 10–15% of the global population and is twice as common in women. IBS and IC/BPS co-occur at notably high rates; studies suggest that up to a third or more of IC/BPS patients also meet criteria for IBS. The bladder and bowel share sacral nerve pathways and lie in close proximity, making neural cross-sensitization between the two organs likely. Flares in one condition often trigger or worsen the other. Dietary modifications, stress management, and medications that calm gut–bladder neural signaling may help address both.

Learn More: International Foundation for Gastrointestinal Disorders

Vulvodynia is chronic vulvar pain, often described as burning, stinging, or rawness, lasting at least three months without an identifiable cause. It may affect up to 8–10% of women. The bladder and vulvar tissues share nerve pathways (particularly the pudendal nerve), and pelvic floor dysfunction is common to both vulvodynia and IC/BPS. Women with either condition should be evaluated for the other, and pelvic floor physical therapy may address both.

Learn More: National Vulvodynia Association

Taking the Next Step

If you suspect you have one or more of these overlapping conditions, bring your full range of symptoms to your healthcare provider. A multidisciplinary approach, potentially involving urology, gynecology, gastroenterology, pain management, pelvic floor physical therapy, and mental health support, can make a meaningful difference. You can learn more about chronic overlapping pain conditions through the Chronic Pain Research Alliance.

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