Parents come to me when their teenager has stopped talking to them. The teenager who used to talk about school, about friends, about what happened that day, now offers almost nothing.

Your teenager's anger has become the loudest thing in the house. Most explanations stop at hormones and the developing brain. Those are real, but they do not tell you what the anger is about.

Something has shifted in your teenager, and you can feel it even if you can't name it. The warmth that used to come easily has been replaced by silence, a short fuse, or feelings that seem out of proportion to whatever just happened. Here's what it actually means.