Journaling Intervention for Temporomandibular Disorder (TMD) and Chronic Overlapping Pain

Inclusion Criteria: * participants between the ages of 18 and 80 * pain in the temporomandibular (TMD) region (jaw and/or temple area) * duration of pain is at least 3 months * average pain score ≥4 on a 0-10 numerical rating scale over the past week * have at least one additional chronic overlapping pain condition (COPC) including fibromyalgia, irritable bowel syndrome, migraine-type headache, tension-type headache, low back pain, interstitial cystitis/painful bladder syndrome or chronic prostatitis, myalgic encephalomyelitis/chronic fatigue syndrome, vulvodynia, and painful endometriosis. * able to read, understand, and write in English. Exclusion Criteria: * history of TMD surgery * neoplasm or injury/trauma to the TMD area * cancer-related pain * scheduled for any surgeries during the study time-frame * current participation in another clinical trial or psychological treatment for any pain-related condition that would interfere with study outcomes * pregnant or lactating * severe motor impairments (e.g., muscular dystrophy) * severe psychiatric conditions (e.g., uncontrolled mood disorders) * severe neurological or cognitive impairments (e.g., uncontrolled Parkinson's disease) * any other conditions that in the opinion of study investigators could make participation in the study unsafe * use of opioids within 48 hours prior to laboratory visit