Poor memory can be caused by a variety of reasons, and the cause should be clarified and treated. Common causes include depression, neurasthenia, Alzheimer’s disease, and post-stroke syndrome. 1. Depression: patients in addition to memory loss is accompanied by lack of interest, depressed mood, poor sleep and other symptoms. Generally given antidepressant treatment after depression, memory can be fully restored to normal levels. 2. Neurasthenia: patients with neurasthenia, the brain nerve will be in a state of long-term tension and fatigue, resulting in significant memory loss. Neurotrophic drugs can be used to improve brain metabolism drugs for treatment, and actively engage in physical exercise, the symptoms can be improved. 3. Alzheimer’s disease: mostly seen in elderly patients, in addition to memory loss can also show spatial disorder, personality disorder and so on. And the symptoms are progressively aggravated. The disease cannot be cured at present, and the memory loss caused by the disease cannot be recovered. 4. Post-stroke sequelae: Memory loss caused by post-stroke is caused by ischemia and hypoxia of brain tissue. Whether it can be recovered depends on the recovery from the stroke, and the prognosis varies from person to person. There are many factors that can cause memory loss, so it is recommended that patients should consult a doctor in time to find out the cause of the problem and take active treatment.