Is this a question or a statement? I have microscopic colitis when I have a flare yes I get a fever. Uc is an autoimmune disease as I am sure you know your immune system is attacking your body so to speak. So when your immune system senses something wrong it will cause a fever because your immune system is trying to "burn off" whatever is making you sick like when you have the flu a fever is supposed to burn off the virus (that's why I don't take a fever reducer when sick because it will take longer for your body to knock off the virus-catch 22 imo).