Problem gambling, or ludomania, is an urge to continuously gamble despite harmful negative consequences or a desire to stop. Problem gambling often is defined by whether harm is experienced by the gambler or others, rather than by the gambler's behavior. Severe problem gambling may be diagnosed as clinical pathological gambling if the gambler meets certain criteria. Pathological gambling is a common disorder that is associated with both social and family costs. The condition is classified as an impulse control disorder, with sufferers exhibiting many similarities to those who have substance addictions.