About 1 out of 8 Americans has migraines. They usually begin during the teenage years. After puberty, migraines are more likely to affect girls and women.
Experts still aren't sure what causes these headaches. But they seem to involve a wave of unusual activity in brain nerve cells, along with changes in blood flow in the brain.
Though migraines can trigger severe pain in the head, they aren't simply headaches. They often also cause other uncomfortable symptoms, such as:
You have a sudden, severe headache. It is the “worst headache of your life.” Or you have had a seizure, are confused, have passed out, or have a change in behavior. These may be signs of a stroke. Call 911.
You have a severe headache with vomiting, limb weakness, double vision, slurred speech, or difficulty swallowing. This may signal a stroke, cerebral hemorrhage, or an aneurysm. Call 911. Get medical help now.