The common pathological causes of gibberish and hallucinations in the elderly are delirium, dementia, and organic psychiatric disorders. Delirium in the elderly is in most cases due to stimuli, such as infections and stress, with sudden babbling occurring more often at night and sometimes remitting. Dementia, on the other hand, occurs continuously, sometimes mildly and sometimes severely. Older adults with organic mental disorders usually have previous underlying cerebrovascular disease. To distinguish delirium, dementia and organic mental disorder, it is necessary to identify the previous underlying diseases of the elderly, such as cerebrovascular problems, hypertension, diabetes, coronary artery disease, ischemic stroke, hemorrhagic stroke, multiple cerebral cavity infarction, cerebral atrophy and other organic brain diseases, as well as systemic organic systemic diseases. The presence of chronic respiratory hypoxia, which leads to a range of systemic hypoxemia in the elderly, should also be considered. It is also necessary to distinguish whether the symptoms of babbling and hallucinations are continuous or intermittent, and whether they are predominantly daytime or nighttime, which can specifically determine delirium, dementia or organic mental disorders in the elderly.