Keep an eye out for those common presenting behaviours that often present with children/teens who are experiencing mood challenges.  They include the following:  

• Irritability/anger, moody
• Persistent sadness or feelings hopelessness, worthlessness or having excessive guilt
• Not enjoying things they used to enjoy
• Behavioural concerns (increase in defiance or tantrums, clingy
• Withdrawn
• Changes in energy level, appetite or sleep
• Trouble concentrating or making decisions
• Suicidal ideation/self harm
• increase in physical complaints 

If  you are concerned reach out to the medical team or a mental health professional and they can further assess and identify supports that might be helpful.