It’s not unusual for children to be secretive on their phones or computers, especially from parents, but if you notice that your child is going out of their way to hide their online activity from you, such as leaving the room when their phone goes off, then it could be a sign that something is wrong. Likewise, if they close windows or hide the computer screen when you walk past, it could be an indication of cyberbullying.
The most obvious sign that a child may be suffering from bullying, cyber or otherwise, is a blanket refusal to leave the house. If they are suddenly looking for excuses to not go to school, such as feigning illness or playing truant, the chances are that they are avoiding something or someone. This could be a sign that they have experienced some form of cyberbullying and do not want to confront their tormentor on the playground.