First I am not an expert on headaches. The regular moderator is busy and I am just watching the place here for a bit.
It is unlikely that the pain you describe is either a tumor or an aneurysm based on one day of pain. A brain aneurysm will cause symptoms that one generally cannot ignore. The pain would likely be so intense as to make it impossible to post a thread on the internet.
Headache pain can come in all forms - from the kind you describe to dull aches, light sensitivity and/or visual distrubances. Viral infections, fever, sinus problems, high blood pressure, tension - are just a few of the things that can cause headaches.
If you still have a headache when you read this - since it is now 2 days since your post - then you really should seek medical treatment.
Moderator Crohn's Disease Forum
CD, Ankylosing Spondylitis, lupus, small fiber peripheral neuropathy, avascular necrosis, peripheral artery disease, degenerative disc disease, and a host of other medical problems.