John has started neglecting his duties in school, exhibiting erratic behavior, having severe mood swings, isolating himself socially, experiencing disruptions in his eating habits, taking reckless actions, and encountering significant academic problems. What do these signs MOST likely indicate?

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Substance abuse. Answer: Substance abuse Neglecting duties in school, exhibiting erratic behavior, having severe mood swings, isolating socially, experiencing disruptions in eating habits, taking reckless actions, and encountering academic problems are signs of substance abuse. Someone with an anxiety disorder may exhibit similar symptoms, but they often also include chronic worrying, physical symptoms (such as heart palpitations), and sleep disturbances. Major depressive disorder shares some symptoms with substance abuse, but also involves persistent feelings of sadness, lack of motivation, and changes in sleep and appetite.

John has started neglecting his duties in school, exhibiting erratic behavior, having severe mood swings, isolating himself socially, experiencing disruptions in his eating habits, taking reckless actions, and encountering significant academic problems. What do these signs MOST likely indicate?

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