I have a strange addiction to eating coffee grounds throughout the day. i stopped for a while, but the urge has returned. is this harmful?

How's the iron level: It is interesting that you say you have iron deficiency; the urge to eat odd things like ice or chalk or even dirt can be a sign of iron or other mineral deficiency. It's called 'pica' and given your history i would definitely get your iron level checked. It can also occur in pregnancy but i would assume that's not your situation. Sometimes ocd or obsessive compulsive disorders are the cause.

YES!!: I noticed that you have listed iron deficiency anemia under your conditions and that you are taking iron supplements. You should not be eating the coffee grounds. The coffee that you are consuming can interfere with iron absorption. Thus, you are likely making your body sick. Please tell your doctor about your coffee addiction - this is important information.