Marked withdrawal from family, friends and activities is a possible indicator that something is wrong. If your teen is spending more and more time alone, avoiding contact with family and friends and skipping activities he or she once took pleasure in, ask about it.
There may be a specific problem that needs addressing, or it could tell you your teen is feeling depressed and alone, a state of mind that lends itself to thoughts of suicide. Letting your teen know you see and care can help alleviate that sense of isolation, and it's an opening to raise the possibility of seeking professional help.
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