Objectives
To describe the prevalence and characteristics of flare-ups of chronic non-specific back pain (CNSBP) among primary care patients, and to examine associations with measures of pain severity and psychosocial factors.
Methods
Six hundred and thirty-four subjects with nonspecific back pain were interviewed by telephone 2 years after an initial primary care visit for back pain. Subjects experiencing flare-ups in the last 6 months reported on frequency, duration, and other characteristics of flare-ups. Using bivariate and multivariate analyses, we compared individuals with and without CNSBP flare-ups with respect to demographic characteristics, measures of pain severity, and psychosocial factors.
Results
51% of subjects reported flare-ups. Physical activities, including lifting and bending, were the most common perceived triggers of flare-ups. Subjects with flare-ups experienced greater levels of pain intensity, disability, opioid medication use, and psychosocial comorbidities. After adjustment for demographic factors, pain intensity, and pain frequency, subjects with flare-ups were more disabled than those without (mean [95% confidence interval] disability score 4.2 [3.9– 4.4] vs. 3.3 [2.9– 3.6]; p <0.0001) and demonstrated higher levels of passive coping (mean passive coping score 4.1[3.8–4.3] vs. 3.4 [3.1–3.7]; p=0.0008).
Discussion
Flare-ups of CNSBP are common among primary care patients, and are independently associated with higher levels of pain intensity, disability, and passive coping. The presence of flare-ups and the perception of activity as a trigger may predispose patients with flare-ups to experience disability not explained by pain intensity alone. Further longitudinal studies are required to better characterize CNSBP flare-ups and determine their clinical implications.