Sign: Depression

"Steve doesn't seem to enjoy anything. He's not rude or hostile, he just doesn't react. His favorite word these days is 'whatever.' He sleeps too much. And he turns his friends down for parties all the time. I'm worried how much time he spends alone these days."

If your child is using drugs that suppress serotonin or other neurotransmitters, depression can often result. First rule out clinical depression due to other causes. If your child's doctor can find no endogenous cause for the depression, look closer at your teen's behavior and activities and note if there are other signs pointing to drug use.

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