<s>[INST] Hi..my 6 year son has had a drastic change in behavior in the past month..he s been out of control..hitting his 16 month old sister..acting out in school which he never does..and nothing i do or say matters to him...he recently told his teacher that his brain is telling him to be bad..and his teacher said that he has been thirsty alot more than usual..i don t know if that matters or not. He has an appointment with a therapist next week but i would like to know if you know what is happening to him? [/INST] Hello,Aggressive behavior, hearing voices to command certain actions, etc., are symptoms which need evaluation and consultation with behavioral pediatrician. Meanwhile, you may ask about things which are worrying your son either friends or problems in school or anything else getting him emotionally disturbed.Hope I have answered your query. Let me know if I can assist you further.Regards,Dr. Khan Shoeb Mohammad Sher Mohammad </s>