I was trying to describe the pain of a Migraine, to a co-worker; which I know you really can't, but I know we all try. 

She said, "well it's all on the head,"

I responded, "no, not really, with migraine, it's actually in the brain, though some of the symptoms may appear on the surface." 

She looked at me kinda funny, and described a couple of headaches that she has had.  Then as she was describing them and how the tended to spread, she said "oh, I see..."

I also talked to her about some of the outward physical symptoms that may appear, including the symptoms that may appear stroke-like (loss of words, numbness, drooping, loss of strength) hopefully not everyone experiences this severe type of pain. 

It provided her with a different perspective than she'd ever know before.