Personal health depends partially on one's active, passive, and assisted observations about their health in their everyday life. The information learned from such observations may be used to inform personal decisions and actions (e.g., "I feel tired in the morning so I am going to try sleeping on a different pillow"), as well as clinical decisions and treatment plans (e.g., a patient who notices his or her shoes are tighter than usual may be having irritation of left-sided heart failure, and may require diuretic medication to reduce fluid overload) for patients who share their observations with their health care providers