 So what does that mean? It's pretty common. And it can be an indication of circulation not being right. But here's where it gets really juicy. This is just fun. Because we've talked about the half moon thing and what each finger having a half moon disappear, what does that mean? So here's what it means. Vertical ridges, ready? On the thumb can mean problems with the spleen, heart, or possibly depression. How about that?