Behaviour problems in a child have to be dealt with sensitivity. These problems are often transient and when dealt with correctly will not become a permanent behaviour . Consult a child psychologist and psychiatrist for detailed evaluation and management. In these cases a family therapy, parenting skills along with counselling of the child often help. Children with ADHD and early onset bipolar disorder are prone to be aggressive.

Your son might be learning these behaviors from school, friends, at home, excessive exposure Media  or gaming. Try to sit down and understand his thoughts and feelings. Kids give certain messages which needs to be picked up very carefully and then help them without being harsh or critical. Try to empathize with the child and show him that you are there for him and trust him completely.