The hand-held device tested in the trial can be used at home
A new hand-held device that delivers a magnetic pulse to the back of the head could become an alternative to drug treatment for people with migraines.
A trial found that 40% of patients were pain free two hours after using the device.
Research showed there were no serious side-effects and patients found the device easy to use at home.
However, doctors say more research is needed to work out the timing of the doses.
Experts from the Albert Einstein College of Medicine in New York carried out the trial to assess the safety and effectiveness of the device.
Previous trials have only involved large, expensive devices which have to be used in a clinic.
The hand-held device emits a single-pulse transcranial magnetic stimulation (sTMS), thought to disrupt the electrical events in the brain which cause the preliminary symptoms of migraines with aura.
Read more about this device for migraine sufferers