like the others said, they aren't bad at all. I've had all 4 tests done (the MRI I had done though was not for my brain, but I've had a CAT scan of my brain before). The EEG, the longest part is them putting the electrodes on your scalp... and be warned, you're hair will look pretty crazy after it. The EKG is the simplest and really short, not much to it. The MRI, like others said the only thing is if you are claustrophobic. I'm not so I had no problem with it. As for the 24 hour heart monitor, the only thing you need to know is that you can't take a shower during those 24 hours, so if you need to get one, get one before they put it on!
is if you are claustorphobic at all---have your doctor prescribe you a one-time dose of valium or some other kind of tranquilizer for the MRI. It is much like that CAT scan, except it is a very narrow, long tube. I thought it was just an open "O" like a CAT scan til I freaked out on the nice, poor MRI tech 
. Lol, I learned very quickly just how much I do NOT like enclosed spaces. BUt other then that, like the pp said these tests are a piece of cake and the best part--there really is NO PAIN!! 
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