Many youth may show behaviors in adolescence that are indicative of substance abuse but can also be considered normal behaviors while growing up. It is important to notice if there are several signs happening simultaneously, if they occur suddenly, and if the behaviors are extreme. The following behaviors in a youth might indicate drug or alcohol abuse: 

• Mood changes (temper flare-ups, irritability, defensiveness) 

• Academic problems (poor attendance, low grades, disciplinary action) 

• Changing friends and a reluctance to have parents/family get to know the new friends 

• A “nothing matters” attitude (lack of involvement in former interests, general low energy) 

• Finding substances (drugs or alcohol) in the youth’s room or personal effects 

• Physical or mental changes (memory lapses, poor concentration, lack of coordination, slurred speech, etc.)