Ahuge portion of the overall cost of health care goes to treating chronic disease because a. chronic diseases are serious and always require expensive surgeries and other procedures. b. chronic disease is an illness with no easy cure or solution, so treatment is typically extensive and long- lasting. c. chronic disease is not preventable, so once a patient has a chronic disease, they have it for life. d. chronic disease is the result of lifestyle, and diseases that are preventable are never covered under insurance.