Distinguishing typical teenage mood fluctuation from a genuine mental health concern is one of the more difficult judgment calls parents face, since some emotional volatility is a normal part of adolescent development. Persistent changes lasting more than a couple of weeks — withdrawal from previously enjoyed activities, significant changes in sleep or appetite, declining school performance without clear cause — warrant more attention than brief, situational mood shifts. Direct, non-judgmental conversation tends to work better than indirect questioning, and creating space for a teen to share what they are experiencing without immediately jumping to solutions or reassurance often opens communication more effectively. Involving a school counsellor early, even before deciding whether outside professional support is needed, provides a useful additional perspective from someone who observes the teen in a different daily context than a parent does. When professional support is needed, involving the teen in choosing a therapist, where reasonably possible, tends to improve engagement with the process compared to a fully parent-directed decision. Taking any expressed distress seriously, without immediately assuming it will pass on its own, remains one of the more protective responses a parent can offer during this period.