Industrial conflicts occur in organizations due to differing perceptions or goals among individuals and groups. Some common causes of organizational conflict include vertical conflicts between hierarchical levels, horizontal conflicts between groups on the same level, and line-staff conflicts over authority. If not addressed properly, conflicts can lead to "we-they" attitudes between groups, distorted perceptions, decreased communication, stress, absenteeism, staff turnover, and reduced productivity. Signs of conflict include colleagues ignoring each other, contradicting one another, and deliberately undermining team cooperation.