When an elderly person has a brain fog, it is recommended that he or she visit a hospital to identify the cause of the problem and then treat it symptomatically. For example, if an elderly person is confused, forgetful or has loss of use or recognition, it may be due to Alzheimer’s disease, and the patient can have an MRI. If there is significant temporal lobe atrophy to be considered as Alzheimer’s disease, it is recommended to give the patient early drug interventions such as Advil or Meperidine to improve the cognitive function of the patient. If the elderly person is suddenly confused and unrecognizable, it may be due to acute cerebrovascular disease, and the patient is advised to undergo magnetic resonance brain function imaging. Brain infarction or cerebrovascular disease near the hippocampus can cause the above problems and requires aggressive treatment for the disease to improve the patient’s symptoms. If an elderly person’s brain is suddenly muddled it may be due to metabolic encephalopathy, such as hypoglycemic encephalopathy or hepatic or pulmonary encephalopathy, which needs to be treated actively for the primary disease.