Memory is not a single function. It involves several brain systems that handle taking in new information, storing it, and retrieving it later. Because so many things can affect these systems, memory problems have many possible causes, and many of them are not related to serious disease.
Normal forgetfulness vs. signs worth discussing
According to the National Institute on Aging, some memory changes are a typical part of getting older, while others deserve a closer look.
Often part of normal aging
- Occasionally misplacing items
- Forgetting a name but remembering it later
- Missing a monthly payment now and then
- Needing a reminder for an appointment
Worth discussing with a clinician
- Repeating the same questions often
- Getting lost in familiar places
- Trouble following familiar steps, such as a recipe or a route
- Memory changes that interfere with daily life
Common factors linked to memory problems
Some of these are treatable
- Sleep problems: poor or insufficient sleep is associated with difficulty concentrating and recalling information.
- Stress, anxiety, and depression: can make it harder to focus and form new memories.
- Medication side effects: some prescription and over-the-counter drugs can affect thinking and memory.
- Nutritional and medical conditions: such as low vitamin B12 or thyroid problems, which a clinician can check with simple tests.
- Alcohol use: heavy or long-term use is associated with memory difficulties.
- Hearing loss and vision problems: can make information harder to take in and are studied as risk factors for cognitive decline.
- Head injury or stroke: can cause sudden or lasting changes in memory.
What research links to long-term brain health
A major 2024 report from the Lancet Commission on dementia prevention identified a set of modifiable risk factors, including high blood pressure, physical inactivity, smoking, excessive alcohol, untreated hearing loss, diabetes, obesity, depression, and social isolation. In general, habits that protect the heart and blood vessels are also associated with better brain health over time.
For progressive conditions such as Alzheimer's disease, there is currently no cure. Clinicians typically start with an evaluation to identify causes that can be treated, and then discuss an individual plan that may include managing blood pressure and other health conditions, staying physically and socially active, and addressing sleep, hearing, and mood.
Putting it together
Occasional forgetfulness is common, and memory problems often have identifiable and sometimes treatable causes. Understanding what may be behind them is a useful first step before discussing options with a professional.
Sources
National Institute on Aging (NIA), “Memory, Forgetfulness, and Aging: What's Normal and What's Not.” · Livingston G, et al. Dementia prevention, intervention, and care: 2024 report of the Lancet standing Commission. The Lancet, 2024;404(10452):572–628. · Alzheimer's Association, “10 Early Signs and Symptoms of Alzheimer's.”