A medical emergency is a situation that requires immediate medical attention to prevent serious harm or death. Common examples include heart attacks, strokes, severe injuries, or allergic reactions. Recognizing these situations quickly can be crucial for effective treatment. In a medical emergency, it is important to call for help, often by dialing emergency services like 911 in the United States. First responders, such as paramedics and emergency medical technicians, are trained to provide urgent care and transport patients to a hospital for further treatment. Prompt action can significantly improve outcomes.