Zapping arm nerves may head off migraines in youth

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

Inclusion Criteria: * youth aged 8-\<18 years with a diagnosis of migraine using gold standard International Classification of Headache Disorders criteria * self-reporting 2-14 headache days/month in the last 3 months * reporting prodromal symptoms that predict a headache within six hours \>75% of the time. To proceed past the 60-day screening period to randomization, participants will need to report 3-28 qualifying prodrome events with \>75% of these events followed by a headache within 6 hours. Exclusion Criteria: * the inability to read or understand English * a diagnosis of psychosis, schizophrenia, or moderate-severe autism, moderate-severe developmental delay or moderate-severe intellectual disability * implanted electrical device * uncontrolled epilepsy (i.e., \>2 seizures in the past year) * abnormal skin on both upper arms * arm circumference \<20 cm * severe cardiac or cerebrovascular disease * prior participation in the trial