Cause for an alarm is a term used to describe any situation that could potentially be dangerous or cause harm. It can refer to a FIRE, a break-in, or any other type of emergency. A FIRE is a sudden and uncontrolled blaze that can spread quickly and cause destruction. A break-in is an illegal entry into a building or property, usually with the intent to commit a crime. Both of these situations can be cause for alarm and require immediate attention.