“If you have a mild headache behind both eyes, that’s most likely to be tension-type headache or an ‘everyday’ headache, and it will usually respond well to over-the-counter medications,” Loder said. “But if the headache is behind just one eye, and is more severe, it could be a migraine or cluster headache. Cluster headaches are a rare type of headache that is more common in men.”
Cluster headaches, Loder said, are also characterized by redness or tearing of the eye on that size or a drooping of the eyelid on that side. In most cases of headache, location, Loder said, is not all that helpful in determining the cause of the headache. Many people who are susceptible to migraines will also report eye strain, bad lighting, or flicker from a computer as triggers for these headaches.