Effects of taVNS on Fibromyalgia Pain

Inclusion criteria

• Older than 18 years old.
• Diagnosis of FM pain according to the American College of Rheumatology (ACR) 2010 criteria (existing pain for more than six months with an average of at least 3 on a 0-10 VAS scale).
• must have the ability to feel sensation by Von-Frey fiber on the forearm.
• Able to provide informed consent to participate in the study.

Exclusion criteria

• Subjects who have unstable medical conditions (e.g., uncontrolled diabetes, uncompensated cardiac issues, heart failure, or chronic obstructive pulmonary disease) or who have functional deficits, as self-reported.
• history of substance abuse within the past six months as self-reported (if the subject reports a history of substance abuse, we will confirm using the Diagnostic and Statistical Manual of Mental Disorders (DSM-V) criteria).
• Presence of implanted cranial electronic medical devices (e.g., cochlear implants).
• pregnancy (as the safety of taVNS in the pregnant population (and children) has not been assessed (though the risk is non-significant), we will exclude pregnant women (and children). Women of child-bearing potential will be required to take a urine pregnancy test during the screening process and every two weeks of stimulation).