why my 3yrs old boy sometimes behaves full crying and stubborn and beats himself on his head and beats his head to wall or beats mom dad ???why whats the reason

A. Sometimes when kids are unable to express what they want then they behave like this and sometimes when they want something and you not giving it because you know it’s not right that is due to frustration it’s a common thing but you cannot let your child hit you in any case you have to stop and hitting on the head and hitting on the wall common you just have to stop that and do regular counselling