Short answer: Some short-term memory loss is a normal part of aging: misplacing glasses or forgetting a name, then remembering later. It becomes a warning sign when it disrupts daily life, such as repeating the same question, getting lost in familiar places, or struggling with bills or cooking. Many causes can be treated, including low vitamin B12, thyroid problems, medicines, depression and poor sleep. Memory loss that comes on suddenly is an emergency.
Normal aging or a warning sign?
| Usually normal aging | Worth a doctor’s visit |
|---|---|
| Forgetting a name, then remembering it later | Asking the same question again and again |
| Misplacing keys and retracing your steps to find them | Putting things in odd places and being unable to retrace steps |
| Occasionally missing a bill payment | Trouble managing money or following a familiar recipe |
| Losing track of the date, then working it out | Getting lost on a familiar route |
| Sometimes searching for the right word | Withdrawing from friends, mood or personality changes |
The key question is whether the memory problem gets in the way of everyday life. Families often notice first; the person may not realize anything has changed.
Treatable causes of short-term memory loss
Before assuming dementia, ask the doctor to check for these common and often reversible causes:
- Medicines: sleeping pills, anxiety medicines, some bladder, allergy and pain medicines, especially in combination.
- Low vitamin B12 and thyroid problems, both found with a simple blood test.
- Depression, which can look very like dementia in older adults and often improves with treatment.
- Poor sleep and sleep apnea. The brain stores memories during sleep.
- Hearing and vision loss, which make it hard to take information in at all.
- Infections and dehydration, especially urinary infections.
- Alcohol, which affects memory more with age.
Sudden memory loss in the elderly
Memory loss that appears over hours or days is different from slow forgetfulness. Possible causes include a stroke, delirium from an infection or new medicine, a head injury, a seizure, very low blood sugar, and transient global amnesia, a brief episode in which a person cannot form new memories for several hours. Each needs prompt medical care. Our guide to delirium vs dementia explains the most common of these.
Signs of cognitive decline in the elderly
When memory loss comes with other changes, it may signal mild cognitive impairment or early dementia:
- Trouble planning, solving problems or following conversations
- Taking much longer to do familiar tasks
- Confusion about time or place
- Poorer judgment, such as with money or strangers
- New suspicion, anxiety or loss of interest; see our guide to paranoia and personality changes
Our guide to the stages of dementia explains how these changes usually progress.
Preparing for the doctor’s visit
- Write down examples of what has changed, and when it started.
- Bring every medicine and supplement, or a complete list.
- Go together, so a family member can share what they have noticed.
- Ask about blood tests, a memory assessment, and a hearing and sleep check.
Keeping memory strong
Daily movement, good sleep, social contact, treating hearing loss and controlling blood pressure have the strongest support for protecting memory. Our guide to natural remedies for memory loss compares habits, herbs and the Traditional Chinese Medicine view, including Brain Vitality, a sealed herbal pouch worn at the navel that some families add to a daily routine alongside medical care.
Questions about memory loss in the elderly
Is short-term memory loss a normal part of aging?
Mild forgetfulness is normal. Memory loss that disrupts daily life, or keeps getting worse, is not, and deserves a medical check.
Can short-term memory loss be reversed?
When it comes from a treatable cause, such as low B12, a thyroid problem, depression, poor sleep or a medicine, memory often improves once the cause is treated.
What causes sudden memory loss in the elderly?
Stroke, delirium, head injury, seizures, low blood sugar and transient global amnesia are the main causes. Sudden memory loss always needs urgent medical attention.
Sources
Alzheimer’s Association: 10 early signs and symptoms · National Institute on Aging: Alzheimer’s and dementia · Alzheimer’s Association: Stages of Alzheimer’s
About the author
Qingcai Wang, MD, PhD, invented the external herbal pouch and has practiced it exclusively since 2015, so that more people can accept Chinese herbal medicine without drinking bitter herbal decoctions. His formulations draw on the classics Shang Han Lun, Jin Gui Yao Lue and Shennong Ben Cao Jing. He previously spent more than 20 years in biomedical and cancer research. He founded Five Essences, which sells the pouches
General education; talk with your own doctor about memory concerns.