Abstract
BACKGROUND: Chronic low back pain (cLBP) is extremely common and is one of the Chronic Overlapping Pain Conditions (COPCs), 10 conditions thought to have similar underlying pathophysiology. Little is known about the prevalence and co-occurrence of cLBP with other commonly accepted conditions referred to as COPCs. METHODS: We assessed participants enrolled in a pragmatic trial of mindfulness-based stress reduction for cLBP to determine the prevalence of co-occurring COPCs using a validated COPC screener. We compared psychosocial and physical functioning among participants with only cLBP and participants with cLBP and additional COPCs using Student's t-tests, chi-squared tests and multivariable linear regression. RESULTS: Among 285 enrollees (age range: 18-88 years, mean age: 52.2 years, SD = 15.3), 272 (95%) reported pain outside the upper and lower back region. One hundred and twenty-nine people (45%) had one COPC, and 68 (24%) had two or more COPCs not including cLBP. The most common COPCs were irritable bowel syndrome (n = 56, 20%); myalgia encephalomyelitis/chronic fatigue syndrome (n = 54, 19%); and fibromyalgia (n = 42, 15%). CONCLUSION: We found strong differences when comparing people with cLBP alone to those with cLBP and COPCs. People with COPCs reported more pain symptoms, higher levels of anxiety, depression, fatigue and scored worse across measures of physical functioning and pain symptoms. An additional COPC was associated with a 7.6-point increase in fatigue scores (95% CI: 5.6, 9.7) on a T-score metric (mean = 50, SD = 10). SIGNIFICANCE STATEMENT: Compared to people with low back pain alone, individuals with additional chronic pain experienced more severe pain symptoms, more anxiety, depression and fatigue. In this sample of people with cLBP, overlapping pain conditions were common, affecting 45% of people. REGISTRATION NUMBER AND REGISTRY NAME: Clinicaltrials.gov identifier NCT04129450.