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Cervical Arterial Disease or CAD may cause interrupted blood supply to the brain resulting in headaches, vertigo, and the diminution of cognitive abilities and memory.
If it happens once, perhaps it was a Transient ischemic attack, as RD suggests. If it repeatedly occurs, then follow up on it.My father apparently started having "night sweats" about 2 years before a brain tumor was diagnosed. Considering the aggressive nature of gliomas, one never knows if there would have been any difference in the long-term outcome had it been diagnosed earlier, but when it was ultimately discovered, treatment options were limited.A brain aneurysm would also be on the differential diagnosis, which I believe is best diagnosed with imaging using contrast media (angiograms). And, an aneurysm, if discovered early enough is treatable. If discovered too late, may not be treatable.
The CAT (or MRI) would detect it only if it was a bad aneurysm that was bleeding a lot, but, if that occurred, you would still be in the hospital.If it was just a bulge, and perhaps a very minimal amount of bleeding, it would need the angiogram to detect it. Possibly an fMRI, but the angiogram is the best. If it is small now, but ruptures later, then it can be really bad. Angiograms, of course, are not without risk, especially if you have plaque buildup in the arteries.Brain aneurysms are often described as the worst headache a person has had in their life (in a person that doesn't normally have bad Migraines). There are a couple of major branch points in arteries where they are most common, but unfortunately I don't remember other related symptoms.