 a sign that could be from that, shortness of breath, any kind of chest pain, headaches, confusion. There's all sorts of different symptoms. And a lot of these symptoms, it's hard to say that it's because of this or because of that because they're very common symptoms that could be for a lot of different problems that you might be having. So sometimes it's hard to diagnose for that reason or to pinpoint it for that reason. And you may be having some of these symptoms and it may not be that at all.