• Negative feelings about themselves
• Sadness or apathy (especially prolonged)
• A tendency to blame themselves
• Loss or increase of appetite (significant changes in weight)
• Changes in sleep patterns
• Constant fatigue
• Chronic but unexplained aches and pains
• Loss of interest in life
• An inability to make decisions
• An inability to analyze and solve problems

They may act out by:

• Increasing alcohol or other drug use
• Changing their pattern of school attendance; truancy
• Becoming delinquent
• Showing major changes in school performance
• Becoming sexually promiscuous
• Taking risk; involving themselves in dangerous undertakings
• Fighting with friends, family and teachers
• Changing their level of activity (e.g. restlessness to boredom)
• Rejecting past friends, family
• Having more accidents; driving dangerously
• Running away from home