Brain fog is one of the most common symptoms I see in practice. People describe it as mental fatigue, poor concentration, and feeling like their mind is wrapped in cotton. After sixteen years of helping patients work through brain fog, I’ve learned that it usually isn’t random. In this article I explain the most common causes I see—from gut inflammation and yeast overgrowth to hormones, stress, cortisol, and environmental toxins—and the strategies that can help restore mental