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Brain zapping for fibromyalgia: placebo or real relief?

NCT ID NCT05903079

Symptom relief Sponsor: Hospital de Clinicas de Porto Alegre Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study tested whether a non-invasive brain stimulation technique called tDCS can reduce pain in women with fibromyalgia. 100 women received either real or sham (fake) stimulation to see if the placebo effect plays a role. The goal is to find out who might benefit most from this treatment.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
transcranial direct current stimulation (tDCS) device
What this could lead to
If successful, this could help identify which fibromyalgia patients are most likely to benefit from tDCS, potentially leading to more personalized pain treatment.
What could go wrong
This is a small, completed study. The placebo effect is strong in fibromyalgia, so any benefit from tDCS may be small or not last long. Results may not apply to men or people outside the study area.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

100 people

The number who actually took part.

Started

Mar 2024

Finished

Jan 2025

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 to 65 years

Sex

Female participants only

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Women aged 18 to 65 years; who can read and write, with a confirmed diagnosis of FM according to the American College of Rheumatology criteria (2010-2016). Pain score equal to or greater than six on the Numerical Pain Scale (NPS 0-10) on most days of the last 3 months. Exclusion Criteria: * Residing outside the greater Porto Alegre area and pregnancy. Contraindications to TMS and tDCS: metallic implant in the brain; medical devices implanted in the brain, cardiac pacemakers; cochlear implant; history of alcohol or drug abuse in the last 6 months; neurological pathologies; hx of head trauma or neurosurgery; decompensated systemic diseases and chronic inflammatory diseases (lupus, rheumatoid arthritis, Reiter's syndrome); uncompensated hypothyroidism; personal history of cancer, past or undergoing treatment.

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Conditions

The condition(s) this trial relates to.

fibromyalgia

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Fibromyalgia

Contacts and locations

Locations

  • Hospital de Clinicas de Porto Alegre

    Porto Alegre, Rio Grande do Sul, 90.450-120, Brazil

More trials for these conditions

Other studies related to the condition(s) this trial covers.