It feels like the brain is lacking oxygen, and things are a bit slow, which may be caused by sleep deprivation, cerebrovascular disease, Alzheimer’s disease, and other diseases, and you need to clarify the cause of the disease first, and then treat it. 1. Sleep disorders: If people often stay up late or have poor sleep quality, lack of sleep can cause dizziness, memory loss, slow reaction symptoms, usually improve sleep, the above symptoms can generally be improved. 2. Cerebrovascular disease: If the elderly have slow reaction, dizziness, headache and other symptoms, it may be caused by cerebrovascular disease, such as cerebral infarction, cerebral hemorrhage, etc., and can check the blood lipids, head CT and other diagnosis. If it is caused by cerebral infarction, thrombolytic therapy can be carried out. If it is caused by cerebral hemorrhage, antihypertensive and cranial pressure lowering therapy can be carried out. 3. Alzheimer’s disease: slow reaction, memory loss, and symptoms similar to cerebral hypoxia in the elderly may be the early symptoms of Alzheimer’s disease, which can be diagnosed by going to the Neurology Department of the hospital for examination. Feeling lack of oxygen in the brain, doing things a little slow, need to go to the hospital for further examination to confirm the diagnosis, to find out the cause and then treatment.