Severe illness refers to a medical condition that significantly impairs a person's health and daily functioning. It often requires immediate medical attention and can lead to serious complications if not treated promptly. Examples of severe illnesses include heart attacks, stroke, and sepsis. These conditions can manifest through various symptoms, such as intense pain, difficulty breathing, or loss of consciousness. Severe illnesses may arise from infections, chronic diseases, or acute injuries, and they often necessitate hospitalization or specialized care to manage the patient's health effectively.