Chronic illness is a research area that focuses on the long-term physical, mental, and emotional health effects of ongoing medical conditions. It involves studying the impact of conditions such as diabetes, heart disease, cancer, and autoimmune disorders on an individual's quality of life, treatment options, healthcare costs, and overall well-being. Research in this area often looks at prevention strategies, management techniques, and ways to improve the lives of individuals living with chronic illnesses. Additionally, it may explore the social, economic, and psychological factors that influence the experience of living with a chronic condition.