Prevention is a systematic process that promotes safe, healthy environments and behaviors and reduces the likelihood or frequency of an incident, injury, or condition from occurring. There are three types of prevention: primary, secondary, and tertiary. Primary prevention is taking action before a problem arises. Secondary prevention is the early detection of the problem, relying on physical changes, symptoms, or abnormal tests to determine action. It focuses on responses that take place shortly after the condition has developed or has been recognized. Tertiary prevention slows or prevents deterioration from a condition, focusing on treatment of and rehabilitation from the consequences of the condition. These are usually long-term responses to ameliorate or prevent further negative effects.