Memory Digest

Treating Depression for Brain Health

Depression is common in later life, can cause real memory problems, and is one of 14 modifiable dementia risk factors; learn the signs and why treatment matters for both mood and the brain.

Last reviewed: October 2026

Depression is not a normal part of aging, and it's not a weakness. It's a common, treatable medical condition, and it matters for the brain. Depression can cause real problems with memory and concentration, and the 2024 Lancet Commission lists it as one of 14 modifiable risk factors for dementia, accounting for about 3% of cases.

If you or someone you know is thinking about suicide, call or text 988 (the Suicide and Crisis Lifeline in the U.S.) or call 911.

How depression and dementia are connected

The relationship goes both ways, and researchers are still untangling it:

• Depression may raise dementia risk. Long-lasting depression, especially in midlife, has been linked to higher dementia risk later. Possible reasons include stress hormones affecting the brain, inflammation, and the way depression leads to less activity, poorer sleep and social withdrawal.
• Depression can be an early sign. New depression for the first time in later life is sometimes an early symptom of brain changes, appearing before memory problems.
• Depression can look like dementia. Severe depression can cause forgetfulness, slow thinking and poor concentration. This was once called "pseudodementia," and it often improves with treatment. See Depression and Memory ("Pseudodementia").
• People with dementia often get depressed. Treating it improves quality of life.

The Lancet Commission recommended treating depression effectively. Whether treating depression prevents dementia hasn't been proven in trials, but treatment clearly helps mood, function and quality of life, which is reason enough.

Signs of depression in older adults

The National Institute on Aging notes that depression in older adults can look different, and may be missed. Signs that last most of the day, nearly every day, for two weeks or more include:

• Persistent sadness, anxiety or "empty" mood
• Loss of interest in activities once enjoyed
• Feeling hopeless, worthless or guilty
• Irritability or restlessness
• Tiredness and low energy
• Trouble concentrating, remembering or making decisions
• Sleeping too much or too little
• Changes in appetite or weight
• Aches, pains, headaches or stomach problems without a clear cause
• Thoughts of death or suicide

Many older adults don't say "I feel sad." They may say they're tired, have no interest in anything, or complain mostly of physical symptoms or memory problems.

Who's at higher risk?

Big life changes and health problems can trigger depression: losing a spouse, retirement, moving, loneliness, chronic pain, heart disease, stroke, diabetes, hearing loss, and caregiving for someone with dementia. Some medicines can also contribute.

Treatment works

The National Institute of Mental Health describes several effective treatments:

• Talk therapy (psychotherapy). Approaches such as cognitive behavioral therapy (CBT) and problem-solving therapy work well for many older adults. Many therapists offer video visits.
• Antidepressant medicines. They can take several weeks to work. A doctor will choose one with fewer side effects for older adults and start low. Some older medicines can affect memory, so ask (see Medications That Can Affect Memory).
• Combination. Therapy plus medicine often works best for moderate to severe depression.
• Other options for depression that doesn't respond, such as brain stimulation treatments, are available through specialists.

Medicare covers depression screening in primary care and mental health services, including therapy. Ask your doctor.

Everyday steps that help

These support treatment, and are good for the brain too:

• Move. Regular physical activity lifts mood and protects the brain (see Exercise and the Brain).
• Stay connected. Call a friend, join a group, volunteer (see Social Connection).
• Get daylight and keep a regular sleep schedule (see Sleep for Brain Health).
• Limit alcohol, which worsens depression.
• Treat hearing loss. Struggling to hear leads to isolation (see Hearing Loss and Dementia).
• Do things you used to enjoy, even if you don't feel like it at first. Mood often follows action.

For families and caregivers

If you notice signs of depression in a loved one, gently encourage them to see a doctor, and offer to go along. Caregivers themselves have high rates of depression. Getting help for yourself is part of caring well (see Caregiver Stress and Burnout).

The bottom line

Depression is common, treatable, and closely tied to brain health. If low mood, loss of interest, or new memory problems have lasted two weeks or more, talk to your doctor. Getting help is good for your mood today and may help protect your brain for the future.

This article is for general information and is not a substitute for advice from your own doctor.

Sources

1. Livingston G et al. Dementia prevention, intervention, and care: 2024 report of the Lancet Standing Commission. Lancet, 2024
2. National Institute on Aging: Depression and Older Adults
3. National Institute of Mental Health: Depression

Not medical advice. This article is general information, not a diagnosis or treatment plan for any individual. Talk with a doctor about your situation.

Related articles

• Depression and Memory ("Pseudodementia")
• Reducing Dementia Risk: The 14 Risk Factors
• Stress, Anxiety and Memory
• Social Connection
• Exercise and the Brain