Ever walked into a room and forgotten why you were there? Lost your train of thought mid-sentence? Read the same email three times and still not absorbed it? That fuzzy, sluggish feeling is often called brain fog — and while it can happen to anyone occasionally, persistent brain fog can sometimes signal an underlying medical issue worth checking. Here’s when brain fog deserves attention. What Is Brain Fog? “Brain fog” isn’t a formal diagnosis. It’s a common term used to descr