Clinical trial Recruiting at 1 site Phase 2 Interventional Ages 18 to 60

tACS to reduce chronic low back pain

Official title: Modulation Effect of Transcranial Alternating Current Stimulation (tACS) on Chronic Low Back Pain

Run by Massachusetts General Hospital · NCT06568198 · Data updated 2026-11-12

The team will try one month of transcranial alternating current stimulation (tACS) to see if it reduces pain in adults with chronic low back pain.

Quick facts

PhasePhase 2
Study typeInterventional
Ages18 Years to 60 Years
SexAll
Enrollment80 (estimated)
SponsorMassachusetts General Hospital
Academic / other
Locations1 site (Charlestown, Massachusetts)
StatusRecruiting
StartedAugust 25, 2025
Main results expectedFebruary 1, 2028
Study endsFebruary 28, 2028
Registry record updatedMarch 16, 2026
Trial IDNCT06568198 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Adults 18–60 with chronic low back pain (>6 months), average pain ≥4/10, able to read at least 10th-grade English and eligible for MRI/MEG/EEG screening are the ideal candidates.

Probably not a fit

Patients with specific structural causes of back pain (for example cancer, fracture, or spinal stenosis), prior complicated back surgery or medicolegal issues, planned surgery during the study, significant cardiac/respiratory/neurologic comorbidity, or contraindications to MRI are unlikely to benefit or to be eligible.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This Phase 2 interventional trial compares real versus sham transcranial alternating current stimulation (tACS) delivered over one month in adults with chronic low back pain. Participants must have pain for more than six months with at least 4/10 intensity and meet MRI/MEG/EEG safety screening. Outcomes will include self-reported pain intensity (NRS) and neurophysiological or imaging measures collected per protocol. The design uses a sham control to separate true stimulation effects from placebo.

Why it matters

Potential benefit: If successful, tACS could provide a noninvasive option to reduce chronic low back pain and potentially reduce reliance on medications or invasive procedures.

How similar studies have gone: Related noninvasive brain stimulation techniques such as tDCS and rTMS have shown modest pain reductions in small studies, but tACS is less studied and evidence for its effectiveness in chronic low back pain remains limited.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

1. Volunteers 18-60 years of age
2. Meet the Classification Criteria of the chronic LBP (having low back pain for more than 6 months)
3. At least 4/10 clinical pain on the 0-10 LBP NRS
4. At least a 10th grade English-reading level; English can be a second language provided that the patients understand all questions used in the assessment measures
5. Meeting the MRI / MEG / EEG screening criteria

Exclusion Criteria:

1. Specific causes of back pain (eg, cancer, fractures, spinal stenosis, infections)
2. Complicated back problems (eg, prior back surgery, medicolegal issues)
3. The intent to undergo surgery during the time of involvement in the study
4. History of cardiac, respiratory, or nervous system disease that, in the investigator's judgment, precludes participation in the study because of a heightened potential for adverse outcome (for example: asthma or claustrophobia)
5. Presence of any contraindications to MRI scanning (for example: cardiac pacemaker, metal implants, claustrophobia, pregnancy, cannot lie still in fMRI scanner)
6. Concomitant autoimmune, chronic, inflammatory, neoplastic, and psychiatric diseases
7. Pregnant or lactating
8. Conditions making study participation difficult (e.g., paralysis, psychoses, or other severe psychological problems as per the judgment of a study investigator during Session 1)
9. Active substance abuse disorders (based on subject self-report and drug test)
10. Regular use of pain medication such as opioids, nonopioid analgesics, coanalgesics, corticosteroids, or immunomodulatory agents
11. Any medical conditions, such as peripheral neuropathy, that could affect the results of QST
12. Current use of psychotropic medication

Where it's running

  • Massachusetts General Hospital
    Charlestown, Massachusetts, United States
    Recruiting

Study contacts

Similar studies

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How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.