What are the early signs of Alzheimer’s disease? The onset of Alzheimer’s disease is often insidious and not noticed by people. Therefore, it is very important to correctly recognize the early symptoms of dementia so that patients can be treated in time and slow down the progress. In the early stage of dementia, memory impairment is very prominent. Patients tend to forget things and lose things, and at the beginning, they show forgetfulness of near things, such as not being able to recall what they just ate a few hours ago. As the disease worsens, the memory of distant things is also affected, such as the inability to recall past experiences. Some patients show affective disorders, with early emotional instability, emotional vulnerability to tears, depression and sadness, anxiety over trivial matters, fear and dread. Some patients have cognitive impairment, starting with inattentiveness, scattered thoughts, repetitive speech, indecisiveness, and inability to make decisions, in contrast to their previous wisdom and competence. Some patients have psychological disorders, due to memory loss, do not know where to put things, always suspect that someone stole his things. Some patients feel somatic discomfort and seek medical examination everywhere, although no abnormality is detected, but still feel pain. Patients with low sexual function often suspect that their spouse is having an affair, which often leads to family quarrels and discord. A few patients have behavioral disorders and become excessively thrifty, collecting scraps everywhere, and some patients compare their simple sketches with those of famous artists, which are treasured. Some patients often go to the wrong house when they arrive at a new environment.