Occasional forgetfulness is a natural part of aging. However, when someone has pronounced trouble recalling past experiences or forming new memories, this condition is known as amnesia. Depending on its origin, amnesia may be transient (short-term) or persistent, and in some cases, it can worsen over time. Amnesia may present as difficulty retrieving previous memories (retrograde amnesia) or creating new ones (anterograde amnesia). Although it’s often linked to dementia, many causes of amnesia are treatable.
Signs and symptoms
Mild lapses, such as misplacing everyday items or occasionally forgetting names, are often part of normal aging or occur during periods of stress. But when memory issues begin to disrupt daily life, it’s important to seek medical advice. Watch for these warning signs:
- Forgetting the purpose of common objects
- Struggling to complete simple chores (e.g. washing dishes, dressing)
- Getting lost or disoriented in familiar settings
- Difficulty finding or using words correctly in conversation
- Repeating stories or phrases within the same discussion
- Asking the same question multiple times
- Losing track of dates, times, or the passage of time
- Exhibiting poor judgment, such as neglecting personal hygiene
- Experiencing marked changes in mood or personality
Common causes
Because memory relies on various brain regions, many factors, beyond normal aging, can impair it. Frequent non-age-related causes include:
- Dementia, including Alzheimer’s disease
- Reduced oxygen flow to the brain (e.g. from smoking or sleep apnea)
- Stroke, which may lead to short-term memory loss
- Chronic stress or emotional trauma
- Excessive alcohol use or recreational drugs
- Nutrient deficiencies, especially vitamins B1 and B12
- Head injuries
- Mental health disorders (depression, anxiety, dissociative disorders, schizophrenia, bipolar disorder)
- Medical conditions (brain tumors, multiple sclerosis, Parkinson’s disease, Huntington’s disease, hyperthyroidism, seizures)
- Brain infections (HIV, tuberculosis, syphilis)
- Major surgery (including brain operations), severe illness, or cancer treatments
- Certain medications (antidepressants, antihistamines, anxiolytics, muscle relaxants, sleeping pills, postoperative drugs)
- Transient Global Amnesia (TGA), a sudden, temporary episode of memory loss lasting 4–6 hours (sometimes up to 24 hours)
Dementia
Dementia describes a cluster of symptoms that impair cognitive functions, memory, reasoning, behavior, and daily activities. Risk factors include:
- Age: Risk escalates with age (about 1 in 30 people aged 70–74, 1 in 8 at 80–84, and 1 in 3 at 90–94)
- Family history of dementia
- Low levels of mental or social engagement
- Heavy alcohol consumption
- Poor nutrition
- Sedentary lifestyle
- Cardiovascular risk factors (high blood pressure, high cholesterol, obesity, diabetes, smoking)
When to see a doctor
If your memory concerns you or begins to interfere with daily life, schedule an appointment with your physician. Pinpointing the underlying cause is essential for effective treatment.
Lifestyle strategies
Maintaining overall health can help preserve memory. Consider these steps:
- Engage in regular aerobic exercise at least twice a week
- Keep blood pressure, cholesterol, and blood sugar within healthy ranges
- Quit smoking
- Limit alcohol intake
- Follow a balanced, nutritious diet
- Maintain a healthy weight
- Manage stress effectively
- Aim for 7–9 hours of sleep per night
- Stimulate your mind with puzzles, language learning, music, or new skills
- Stay socially active