Tension headache: This is your garden-variety headache, with diffuse pain wrapping across the top of your head. These headaches often result from stress or lack of sleep. They’re not usually disabling and typically fade overnight.

Migraine headache: Migraines tend to hit one side of the head, and can last from several hours to several days. They’re usually marked by a sensitivity to sound and light.

Cluster headache: This one is an excruciating attack that explodes behind one eye, reaches a crescendo after about an hour, and then vanishes—only to return in a day or so. This can go on for a few weeks, and then stops for months. Numerous drugs target clusters headache, including some of the migraine medicines.