Lately my urine has been kind of a light-greenish color. I thought at first that it was because I wasn't going very much, and that's what it looked like when a lot of water mixed with not very much urine. But I have been going A LOT, and it's still that color. Then I paid attention to my drinking habits, and I haven't been drinking a lot of fluids, especially not more than I usually do, so it can't be that. It just seems really abnormal to me. Is this something that I need to be concerned about? What might be wrong?