Efficacy and Safety of Nerivio™ for Acute Treatment of Migraine in People With Chronic Migraine

This open label study includes up to 2 visits. The enrollment and device training may occur in 2 separate visits. First visit - The first visit will include screening, enrollment and training on the application and device. Treatment phase - Participants will be instructed to use the device for the treatment of qualifying migraine headaches (see below) as soon as possible and always within 60 minutes of onset during a period of up to 4 weeks. Participants will be instructed to use the device with the intensity level identified during the device training visit (and adjust as necessary) and make sure the stimulation is perceptible but not painful. Participants will be instructed to avoid taking rescue medications within 2 hours post-treatment. If medications are used, participants will be instructed to record in the app when and which medication was taken at 2- and 24-hours post treatment. The participants will use the app to record pain intensity levels, the presence/absence of aura and associated migraine symptoms (nausea, photophobia, phonophobia, and allodynia l) as well as rate their stress level and functional disability at baseline, 2- and 24-hours post-treatment. At the beginning of each treatment, participants will also be asked to report the time elapsed from attack onset. Adverse events will be reported throughout this phase of the study directly to the site staff. Participants who do not achieve satisfactory relief at 2 hours post-treatment may treat again with the Nerivio™ device or may treat with usual care at that time or any time thereafter if the headache does not resolve. Participants will also be able to treat headache recurrence with the device. Migraine headaches that are not treated with the device may be treated with usual care. The first reported treatment will be considered a "training" treatment, aimed to verify that the participants use the device properly, and will only be included in the safety analysis. The efficacy evaluation will be performed on the first treatment of a qualifying attack (see below) following the training treatment (hereby termed "test treatment"). Second (final) visit - End of study: Participants will return to the clinic following the end of the treatment phase, at which time they will return the device. The participants will have the option of returning the device by mail instead of an on-site visit.