I feel a little silly because I know lots of people get dark circles under their eyes, but I just noticed that I had them a few days ago, and I started thinking of "what ifs". I don't think I usually have circles under my eyes. I feel like I sleep well, but I probably don't go to bed early enough. I came down with a mild cold the day after I noticed them. Maybe it's just because I'm getting older (I can see 30 from here!). But I started looking it up online and I read somewhere that they can be caused by liver or kidney problems. Then the panic set in. What if I have hepatitis? What if my kidneys are failing? What if those dark circles are a sign of something awful even though I don't have any other symptoms? I know that having circles under your eyes is really common and it's hardly ever caused by anything serious, but I can't stop thinking about what if.