My 4 yr child’s hearts beat so fast if she falls unexpectedly or if sone one shouts at her for her meschiefs why so?

A. But that is very common for a child to happen kids fall down hundred times in the day when they are growing of such is not a problem and why somebody screaming and yelling at the child first of to see that you have to tell them that it was a child the child is going to be mischievous only is the time to time is not doing anything which is having any person there should be no problem