There are several forms of complex migraines, and they occur when blood flow to the brain decreases, blood vessels over dilate or the trigeminal nerve becomes irritated, reports CNN. These neurologic occurrences last longer than the headache.
More than 28 million Americans suffer from complex migraines, as reported by the Mayo Clinic in 2011, and the condition is more common in women. While headaches and migraines can be very painful or even disabling, complex migraines are more severe. Symptoms include difficulty speaking, headache, loss of vision and weakness. Complex migraines may bring on other serious conditions, including depression, heart abnormalities and strokes. Complex migraines can be treated with medication. In most cases, the medication decreases the number of episodes and severity, says CNN.