Why Is Hell Considered A Curse Word?

I finally got to sleep at 3:00 AM last night. But theeeeen I woke up at like 4:00 and had the urge to go get some water. And for some reason I didn't want my room to be dark so I sat on the edge of my bed and spent a whole five minutes trying to find that green thing - when the fan is on it flies around everywhere. Finally I got it on and once I did I was too tired so I turned off the light and then laid down to sleep again. Isn't that a fantastic story?

Well Darling, I hope you had a marvelous day.

And yeah, seriously, why is hell considered a curse word?