Geriatric syndrome is a multiorgan disease specifically suffered by older people. The most common diseases of geriatric syndrome are dementia and dementia-related psychological symptoms, depressive symptoms and suicide, cerebrovascular diseases, ischemic heart diseases, hypertension, pneumonia, diabetes mellitus, renal dysfunction, cancer, osteoporosis, falls and bone fractures and oral hygiene impairment. These patients finally become self-care-dependent older people and enter a terminal stage. The frequency of multiorgan diseases is increasing with age. In order to care for these multiorgan diseases, many organ-oriented specialists have to participate, such as neurologists for dementia, psychologists for dementia-related psychological symptoms, psychosomatists for depressive symptoms and suicide, neurosurgeons for cerebrovascular diseases, cardiologists for ischemic heart disease and hypertension, pneumologists for pneumonia, endocrinologists for diabetes mellitus, kidney specialists for renal dysfunction, orthopedists for osteoporosis and falls and bone fractures, dentists for oral hygiene, surgeons for cancer, care workers for self-care-dependent older people and hospice care for the terminal stage due to cancer and frailty of aged people. After a single organ