If you’ve ever experienced brain fog, anxiety, or mood issues alongside your autoimmune symptoms, you’re not alone. Doctors know that mental health issues often increase with an autoimmune diagnosis, and a new scientific discovery might explain why. There are cells in the brain called microglia that are actually part of the immune system. And just as our body’s immune system can go into overdrive and cause chronic inflammation with autoimmune disease, the same thing can happen in our brains. My guest is science journalist Donna Jackson Nakazawa. Her latest book is called The Angel and The Assassin, and it’s all about these little brain cells and how they can help us or harm us.