Headaches Headaches Headaches are pains that occur in different parts of the head.
Headaches can be very mild or excruciating.
There is usually no single cause, and can be triggered by numerous things. Migraine headaches occur when the blood vessels in the cranium begin to expand and contract very rapidly. They can be caused by allergic reactions and it is speculated that there is a genetic factor. Migraines are also sometimes accompanied by nausea or vomiting. Some migraines can last for a long period of time.