Pain intensity trajectories among veterans seeking mental health treatment: Association with mental health symptoms and suicidal thoughts and behaviors.

Background: The purpose of this study was to identify classes of pain intensity trajectories among veterans reporting suicidal ideation with no prior mental health treatment experience. We were interested in also assessing factors associated with the pain trajectory classes.
Methods: A total 747 participants completed measures of pain, depression, suicide ideation and behaviors, insomnia, substance use, and PTSD. Follow-up assessments were completed at 1-, 3-, 6-, and 12-months post-baseline. Growth mixture modeling was conducted, and pain trajectories were modeled from baseline to month 12.
Results: Three classes were identified: mild pain intensity that increased over time to severe pain intensity (Increasing-Severe; n = 9), low pain intensity that decreased over time (Mild-Decreasing; n = 172), and moderate pain intensity that remained relatively stable over time (Moderate-Stable; n = 566). The Moderate-Stable trajectory had more severe PTSD symptoms, more frequent depression symptoms, and more severe insomnia. The odds of endorsing suicide ideation at month 12 were significantly higher in the Moderate-Stable trajectory compared to the Mild-Decreasing trajectory.
Conclusions: This was the first study to assess classes of pain intensity trajectories among individuals who were treatment naïve for mental health issues. The findings suggest that a moderate stable trajectory of pain intensity over the course of 12 months is common and associated with a more severe clinical profile, including suicide ideation. This study underscores the importance of addressing pain intensity among individuals seeking mental health treatment, particularly for those with pain intensity that is moderate and stable over time.
(Copyright © 2021. Published by Elsevier B.V.)