Early dementia (can even be seen to have been present before the diagnosisDiagnosis The process by which a physician determines what disease a patient has by studying the patient's symptoms and medical history and by analyzing any tests performed (blood, urine, brain scans, etc.). - i.e. as a very early signSign In medicine a sign is what a physician finds by examining a patient. For example, a patient with the symptom of pain might have signs of a fast heart rate, a pale face, a clammy touch and tenderness.). This might be lost in later stagesStages Course of disease progression defined by levels or periods of severity: early, mild, moderate, moderately severe, severe of the disease as insight into the disease is lost.