When my blood sugar is low (from about 70 and lower, yes. I have what seems like a high fever, sweats and shaking. That stops as it rises back over 70. While (in my mind but any doctor I have discussed this with says that I shouldn't be able). I can feel 'something when I am running too high. I claim to be able to sense when I am over 200, but the feeling isn't necessarily feeling hot. I really can't tell you how I know but I do.I've been an insulin-dependent diabetic for 20 years. You just have to know yourself. That comes by testing a lot. Hope this helps.