The phenomenon of memory loss can be related to physiological factors, but also may be caused by Alzheimer’s disease, insufficient blood supply to the brain and other factors. 1. Physiological factors: people who stay up late for a long time and have poor sleep can also experience memory loss, and the symptoms of memory loss can be improved after improving sleep. 2. Alzheimer’s disease: a kind of central nervous degenerative disease that occurs in the pre-age and old age, which can be manifested as memory loss, mental behavioral abnormalities and other clinical symptoms. 3. Cerebral blood supply insufficiency: common in patients with hyperlipidemia, hypertension, diabetes mellitus, cerebral arteriosclerosis and long-term smoking. Due to blood viscosity, thickening of blood vessel wall, narrowing of blood vessel lumen and other reasons, blood flow is slowed down, resulting in limitation of blood supply to the brain, which leads to symptoms of cerebral dysfunction, such as dizziness, lightheadedness, dizziness, weakness of limbs, memory loss, tinnitus and so on. Memory loss may also be related to other causes, it is recommended to consult a doctor in time to identify the cause of the disease and actively cooperate with the doctor’s treatment.