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.
If you have a migraine headache that lasts longer than one or two days, you should seek the care of a physician. In a tension headache, muscle tension in the face, neck, and other parts of the headache will restrict the flow of blood in these areas, resulting in pain. Taking aspirin or acetaminophen will usually cause the headache to diminish. Sinus headaches are caused by an increase in fluid and pressure in the sinus cavities or an infection in the sinuses. Taking aspirin or acetaminophen along with an antihistamine will usually help.