There are many kinds of mental abnormalities in the elderly: first, in diseases of the elderly, such as cerebrovascular diseases, that is, cerebral infarction and cerebral hemorrhage, if the brain tissue in charge of mental or personality is involved, he may have some corresponding symptoms, such as personality changes, hallucinations, visual hallucinations, auditory hallucinations, delusions, such as jealous delusions, delusions of victimization, and he will talk nonsense. For example, if the patient has visual hallucinations, he will always talk about things that do not exist, he may say he sees a mosquito, he sees a puddle of water or something like that, and he may make his family think he is talking nonsense; with auditory hallucinations, he may say I hear a person telling me what he wants me to do, or some people say someone is saying they want to harm me, and his family may find out he is talking nonsense. Secondly, when cerebral infarction, cerebral hemorrhage, brain tumor or encephalitis affects the speech center, such as when sensory aphasia is involved, he may not understand what others say, so he may appear to be talking nonsense, that is, others ask for something and he answers west, which also appears to be nonsense. Once you find out that the elderly are talking nonsense, you must seek medical attention in time to find out what causes the nonsense, whether it is an organic problem in the head or a mental illness of the elderly.