When stimulated, nerves send electrical signals to the brainstem which connect to nerves of the cortex and its covering, the dura.
When the system does not work properly, electrical signals set off a slowly moving wave of electrochemical activity across the surface of the brain. People with migraine may start to experience odd sensations, such as what looks like white sparks (a misfiring of the ocular nerve) followed by an intense pain in some part of the head and concluding with a long period of nausea (activation of the gastrointestinal system) and exhaustion (general inflammation and swelling of the cortex).
This abnormal wave of electrochemical activity Is often stimulated by several different stimuli.These stimuli are irrational signals from other parts of the nervous system, such as stress, irregular sleep, a flashing light, a range of food ingredients, weather changes, and noise.Sometimes the migraine symptoms occur spontaneously, without a trigger.
