Frontotemporal dementia is a kind of Alzheimer’s disease. The two most important manifestations of frontotemporal dementia in the late stage are as follows: 1. speech disorders: manifested as non-fluent aphasia, patients can’t name familiar things or stutter in speech, some patients have stereotyped language, manifested as the same thing kept telling; 2. behavioral abnormalities: patients with frontotemporal dementia will be off-willed and have behavioral disorders, such as unkempt and aggressive behavior; Excessive desire, such as strong sexual impulse, asking the elderly at home to have sex with them; most patients have behavioral changes, such as the original love to talk suddenly do not talk, or the original do not talk suddenly babbling. If a patient shows abnormal behavior, he or she needs to be seen and treated promptly.