Behaviours of concern are sometimes called challenging behaviours. Behaviours of concern are words that describe a kind of behaviour. They are behaviours people do that may be a problem for them or others. Behaviours of concern can be when someone does things that hurt themselves, other people or things. This behaviour can stop them from doing things that other people do. These things may be going to work or seeing their friends. These behaviours can seriously hurt people. These behaviours can be very stressful and upsetting.