Skip to content

Brain & Nervous System Health Center

Font Size

Confusion, Memory Loss, and Altered Alertness - Topic Overview

It is not unusual to occasionally forget where you put your keys or glasses, where you parked your car, or the name of an acquaintance. As you age, it may take you longer to remember things. Not all older adults have memory changes, but they can be a normal part of aging. This type of memory problem is more often annoying than serious.

Memory loss that begins suddenly or that significantly interferes with your ability to function in daily life may mean a more serious problem is present.

  • Dementia is a slow decline in memory, problem-solving ability, learning ability, and judgment that may occur over several weeks to several months. Many health conditions can cause dementia or symptoms similar to dementia. In some cases dementia may be reversible. Alzheimer's disease is the most common cause of dementia in people older than age 65.
  • Delirium is a sudden change in how well a person's brain is working (mental status). Delirium can cause confusion, change the sleep-wake cycles, and cause unusual behavior. Delirium can have many causes, such as withdrawal from alcohol or drugs or medicines, or the development or worsening of an infection or other health problem.
  • Amnesia is memory loss that may be caused by a head injury, a stroke, substance abuse, or a severe emotional event, such as from combat or a motor vehicle accident. Depending upon the cause, amnesia may be either temporary or permanent.

Confusion or decreased alertness may be the first symptom of a serious illness, particularly in older adults. Health problems that can cause confusion or decreased alertness include:

    1|2
    Next Article:

    Today on WebMD

    nerve damage
    Learn how this disease affects the nervous system.
    senior woman with lost expression
    Know the early warning signs.
     
    Close up of eye
    12 culprits that affect your ability to focus.
    medical marijuana plant
    What is it used for?
     
    senior man
    Article
    brain research briefing
    Article
     
    Syringe
    Article
    Vaccine and needle
    VIDEO
     
    mans hands on laptop keyboard
    Article
    brain illustration stroke
    Slideshow
     
    most common stroke symptoms
    Article
    Parkinsons Disease Medications
    Article