The word dysphagia means difficulty swallowing, which is something I deal with a lot in my work. One problem I've had lately how to pronounce it.
Until I started working at my current job, I always pronounced the first "a" as a long vowel sound. Dysphay-gia. But for some reason, everyone here pronounces it as an "ah" sound. Dysphah-gia.
After looking it up, I felt that I was correct and everybody else was wrong. So I persisted in pronouncing it the same way. But strangely enough, nobody knew what I was talking about. Even the dictation system was interpreting the word as "dysphasia." When I was having a conversation with a neurologist, a very brilliant person, he actually didn't know what I was talking about when I used my usual pronunciation. He looked at me, baffled, and said, "Do you mean dysphah-gia?"
I'm still convinced that I'm right. But I've given up, and started pronouncing it the wrong way.