A Study of Retatrutide (LY3437943) in Participants Who Have Obesity or Overweight and Chronic Low Back Pain

Inclusion Criteria: * Have a history of axial-predominant low back pain * Have pain that is restricted to the low back or with a referral pattern limited to the proximal legs * Have a body mass index (BMI) ≥27 kilograms per square meter (kg/m2) at screening * Have a history of at least 1 self-reported unsuccessful dietary effort to lose body weight Exclusion Criteria: * Have a non-axial origin low back pain * Have had botulinum or steroid injections to the spine within 1 year of screening * Have had trigger point injection to the spine within 6 months of screening * Have a self-reported change in body weight \>5 kilograms (kg) (11 pounds) within 90 days prior to screening * Have been taking drugs to promote body weight reduction, including over-the-counter medications, within 90 days prior to screening * Have a prior or planned surgical treatment for obesity * Have Type 1 Diabetes, Type 2 Diabetes, or any other type of diabetes