Chronic Pain Master Protocol (CPMP): A Study of LY3526318 in Participants With Chronic Low Back Pain

Inclusion Criteria: * Have a visual analog scale (VAS) pain value ≥40 and \<95 during screening. * Have a history of daily pain for at least 12 weeks based on participant report or medical history. * Have a body mass index \<40 kilograms per meter squared (kg/m²) (inclusive). * Are willing to maintain a consistent regimen of any ongoing nonpharmacologic pain-relieving therapies (for example, physical therapy) and will not start any new nonpharmacologic pain-relieving therapies during study participation. * Are willing to discontinue all medications taken for chronic pain conditions for the duration of the study. * Are at 18 years old or older at the time consent is signed. * Have a history of low back pain for at least 3 months located between the 12th thoracic vertebra and the lower gluteal folds, with or without radiation. * Have a history of low back pain as classified by the Quebec Task Force Category 1 through 3. * Are men, or women able to abide by reproductive and contraceptive requirements. Exclusion Criteria: * Have had a procedure within the past 6 months intended to produce permanent sensory loss in the target area of interest (for example, ablation techniques). * Have surgery planned during the study for any reason, related or not to the disease state under evaluation. * Have, in the judgment of the investigator, an acute, serious, or unstable medical condition or a history or presence of any other medical illness that would preclude study participation. * Have had cancer within 2 years of baseline, except for cutaneous basal cell or squamous cell carcinoma resolved by excision. * Have fibromyalgia * Have a substance use disorder as defined by the Diagnostic and Statistical Manual of Mental Disorders (5th edition; DSM-5; American Psychiatric Association). * Have a positive human immunodeficiency virus (HIV) test result at screening. * Are, in the judgment of the investigator, actively suicidal and therefore deemed to be at significant risk for suicide. * Have an intolerance to acetaminophen or paracetamol or any of its excipients. * Have a history of alcohol, illicit drug, analgesic or narcotic use disorder within 2 years prior to screening. * Have used a therapeutic injection (botulinum toxin or corticosteroids) in the 3 months prior to starting the washout period. * Have history of or current compression fracture. * Have had a recent major trauma (within 6 months of baseline). * Have a history of low back pain as classified by the Quebec Task…