Some patients with brain atrophy may not exhibit any specific clinical symptoms and are only found to have brain atrophy through imaging studies, such as magnetic resonance imaging (MRI) of the brain. Some patients do exhibit clinical symptoms, and the common symptoms of brain atrophy mainly include the following manifestations. First, patients may experience a decline in memory function, such as frequently forgetting things they have just done, forgetting where they placed their wallet, or forgetting to bring keys when going out. Second, there may also be a decline in executive functions, such as difficulties in dressing or brushing teeth by oneself. Third, there may be a decline in computational abilities, to the extent that the patient cannot perform simple arithmetic. Additionally, brain atrophy may also present some psychiatric symptoms, such as hallucinations and incoherent speech.