Hello I had a concussion about three months ago and have done a fair bit of research. I live in Canada and we are in the heart of cold and flu season . I have looked for a post like this but was unable to find one. I was wondering if anyone has found that there immune system has been low and get sick really easily? I find it hard to tell the difference sometimes between concussion symptoms and just the normal cold or flu. I had a bad sinus infection 2 weeks ago. Thanks I’m just taking it easy and waiting for summer!