I've always had headaches but some months are worse than others. I wear glasses for driving but generally not for every day wear (it's a psychological thing) and I've generally put it down to that.
After 3-4 days of a constant splitting headache which felt like I'd been hit with a cleaver, I noticed a lump at the back of my head/neck. This was finally enough to make me go to the doctor (obviously fearing brain cancer or some other deathly disease). The doctor diagnosed "Occipital Neuralgia" [1] which is basically the compression of one of the scalp nerves as it exits the spinal column. As I often end up slumped forward in my chair, head angled up, this was compressing those nerves and causing the pain. It had never occurred to me that the pain could have a physical cause. Since then, better posture control has meant very few headaches.
The lump it turns out is just a swollen glad, possibly from an unrelated minor infection or from the swollen nerve itself.
Pains in the back of the head, or down the side of the face it is almost certainly neck/back related. After suffering a couple of years with on/off head pain I finally figured this out & it literally took a couple of sessions to work the tightness out.
(I had a scare too because the trapped nerves in my neck caused lumps to appear all up and down the length of it :S not fun!)
So, yeh, I second the recommendation to get a medical professional to look at posture.
After 3-4 days of a constant splitting headache which felt like I'd been hit with a cleaver, I noticed a lump at the back of my head/neck. This was finally enough to make me go to the doctor (obviously fearing brain cancer or some other deathly disease). The doctor diagnosed "Occipital Neuralgia" [1] which is basically the compression of one of the scalp nerves as it exits the spinal column. As I often end up slumped forward in my chair, head angled up, this was compressing those nerves and causing the pain. It had never occurred to me that the pain could have a physical cause. Since then, better posture control has meant very few headaches.
The lump it turns out is just a swollen glad, possibly from an unrelated minor infection or from the swollen nerve itself.
[1] http://en.wikipedia.org/wiki/Occipital_neuralgia