Usual Care: Participants will receive guidance on over-the-counter and prescribed pain medications to use to treat their chronic low back pain symptoms. The Research Coordinator (RC) will provide instructions for low back pain stretching and strengthening exercises. The Licensed Provider (LP) will determine if any exercises should be excluded based on their physical limitations. Participants enrolled in the usual care treatment arm will track the frequency of their back stretching and strengthening exercise sessions on the Pain Medication & Exercise Diary. For the purpose of this study, treatment compliance will be met if participants complete the exercises a minimum of three times per week.

Biomodulator + Usual Care treatment group: Usual care, as described above, will be provided to all participants randomly allocated to this treatment group, in addition to treatment with the Biomodulator three times per week x 4 weeks. The licensed provider will review medication and treatment logs, prescribe pain medications as indicated, and assess for treatment side effects. In addition to treatment with the Biomodulator, the participant will perform back stretching and core strengthening exercises for a minimum of three times per week as instructed and will be told to use their prescribed pain medications as needed to self-treat their low back pain symptoms (as previously described above).

The Biomodulator is a type of very low frequency TENS known as pulsed electromagnetic field therapy (PEMF). Unlike TENS devices that deliver 1-80 milliamperes of electrical current, PEMF devices deliver short bursts of electrical microamperes (millionths of an ampere) to injured tissues without producing heat or interfering with nerve or muscle function. Micro-current levels between 20-500 microampere appear to be most effective at relieving pain and inflammation and promoting tissue healing by realigning the natural electrical balance that exists within the cells that has become disrupted due to injury.