For people in their 60s and beyond, conversations often turn to retirement, grandchildren, or travel plans. But underneath those lighter topics, many are quietly worried about something else: their memory, their mood, or a parent's growing forgetfulness. Depression, anxiety, and dementia are closely linked, and understanding how is one of the most useful things a family can learn.
These conditions are deeply intertwined with physical and cognitive health. Ongoing research continues to sharpen our understanding of how mood disorders like depression and anxiety relate to dementia risk, and to the day-to-day experience of living with cognitive decline.
What Does It Mean to Have Dementia?
Dementia isn't a single disease. It's a broad term for a decline in memory, thinking, and reasoning severe enough to interfere with daily life. Alzheimer's disease is the most common cause, but vascular dementia, Lewy body dementia, and other conditions can produce similar symptoms.
Occasional forgetfulness is a normal part of getting older — misplacing your keys or blanking on a name happens to almost everyone. Dementia is different. According to the CDC, dementia is not a normal part of aging. It involves a noticeable decline from a person's previous level of functioning, not an occasional slip.
Signs that someone may be experiencing dementia-related cognitive changes, rather than typical age-related forgetfulness, include:
- Trouble finding words or following a conversation.
- Difficulty with reasoning, planning, or problem-solving.
- A shortened attention span.
- Increasing trouble concentrating or remembering recent events.
In the earlier stages, people often lose track of the date, struggle to follow the thread of a conversation, or have a harder time managing finances and medications.
What Does the Current Research Say About Dementia, Depression, and Anxiety?
According to Harvard Health, symptoms of depression and anxiety are common in people with mild cognitive impairment (MCI) and dementia. When mood symptoms and cognitive symptoms occur together, they tend to compound each other, making daily life harder for the person and for the people caring for them.
The relationship also runs in the other direction. A large 2025 study published in The Lancet Psychiatry followed nearly 5,900 adults for more than two decades and found that certain depressive symptoms in midlife — particularly a loss of self-confidence and difficulty coping with problems — were linked to meaningfully higher rates of dementia decades later, even after the original depressive episode had resolved. Other symptoms often associated with depression, like low mood or sleep changes on their own, showed no clear connection. Researchers are careful to note that this is an association, not proof that depression causes dementia: A shift in mood could be an early, subtle sign of the same brain changes that eventually produce dementia, or the two conditions may share an underlying cause, such as vascular disease or chronic inflammation.
Anxiety appears to matter, too. A 2025 review from the Alzheimer's Society found that moderate to severe anxiety in midlife was linked to a higher likelihood of developing dementia later on, and an earlier systematic review and meta-analysis found a similar pattern in people with a history of significant depression, anxiety, or PTSD. As with the depression research, experts caution that we don't yet know whether anxiety is an independent risk factor, an early symptom of developing dementia, or both.
What does seem consistent across the research is that having more than one of these conditions raises the stakes. One recent study found that people with both a mood disorder and an anxiety disorder had a notably higher risk of dementia than people with just one, and the risk climbed further with each additional psychiatric diagnosis. This doesn't mean mental illness makes dementia inevitable — most people with depression or anxiety never develop it — but it's one more reason mental health deserves the same attention as physical health as we age.
Whatever the underlying biology turns out to be, the day-to-day effects of dementia, depression, and anxiety often feed off one another. This comorbidity can quickly diminish a person's quality of life: cognitive changes make it harder to keep up with hobbies, routines, and relationships, and as people pull back from activities they once enjoyed, feelings of anxiety and depression often follow. That withdrawal can deepen isolation, which in turn worsens mood and makes cognitive symptoms feel even more overwhelming.
Psychosocial interventions — approaches that combine emotional support with structured activity and social connection — are one promising way to interrupt this cycle, though researchers agree more study is needed. It's also worth knowing that older adults with dementia face a higher risk of suicidal thoughts and attempts than is often assumed, which makes early recognition and treatment of depression and anxiety in this population especially important.
People experiencing the early stages of dementia are often more vulnerable to these risks, particularly as feelings of disconnection grow. Family members may not immediately recognize the connection between a loved one's memory changes and their mood, but reaching out to a psychiatrist or other mental health professional is a meaningful first step.
Why These Conditions Are Often Missed
Behavioral health concerns in older adults are frequently overlooked. Depression in older adults is well documented as underdiagnosed and undertreated, and suicide rates tend to rise with age rather than fall — which makes it especially troubling that depression in adults over 65 so often goes unrecognized.
One reason is that the symptoms overlap. Confusion, appetite changes, sleep problems, and social withdrawal can all look like ordinary signs of dementia — but they're also hallmark symptoms of major depressive disorder. When an older adult's mood, energy, or personality shifts, it's easy for families, and even clinicians, to chalk it up to "just getting older" rather than considering a treatable mental health condition.
What This Means for You or Someone You Love
None of this research means depression or anxiety will inevitably lead to dementia, or that a dementia diagnosis means depression is inevitable — most people navigate these conditions without ever experiencing the other. What it does mean is that mood changes in yourself or someone you love, especially later in life, are always worth taking seriously. A thorough evaluation can help sort out what's happening and what kind of support will help most, whether that's therapy, medication, social engagement, or some combination of the three.
If you're noticing new anxiety, low mood, or memory changes in yourself or a family member, our team at Emerald Psychiatry is here to help you figure out what's going on and build a plan that fits your life. Learn more about the conditions we treat, or reach out to schedule a conversation.
Sources
- Specific midlife depressive symptoms and long-term dementia risk: a 23-year UK prospective cohort study — The Lancet Psychiatry (2025)
- Six midlife depressive symptoms linked to dementia decades later — News-Medical
- Moderate to severe mid-life anxiety may be linked to later-life dementia — Alzheimer's Society (2025)
- Risk of Dementia in Persons Who Have Previously Experienced Depression, Anxiety, or PTSD: A Systematic Review and Meta-Analysis
- Having two or more mood/anxiety disorders may increase dementia risk by up to 90% — Medical News Today
- What works best for treating depression and anxiety in dementia — Harvard Health
- About Dementia — CDC
- Depression in older people is underdiagnosed — PubMed
