Chronic disease refers to health conditions that persist over an extended period of time, often for years or a lifetime. These diseases may be caused by a variety of factors, including genetics, lifestyle choices, and environmental exposures. Common chronic diseases include heart disease, diabetes, cancer, and arthritis. Research in this area focuses on understanding the causes of chronic diseases, developing effective treatments and prevention strategies, and improving the quality of life for individuals living with these conditions. This research often involves interdisciplinary collaboration between medical professionals, scientists, and public health experts.