# Understanding Dementia: A Family Guide to Types & Care > A clear, compassionate guide to what dementia is, how it's diagnosed, and the most common types families encounter. ## Meta - URL: https://aegisv2.epekdigital.com/resources/blog/understanding-dementia-a-guide-for-families-and-loved-ones - Focus keyword: understanding dementia - Category: memory-care-dementia - Tags: dementia, alzheimers, sleep, brain-health, for-caregivers, for-spouses, communication - Published: 2025-09-22 Dementia is an umbrella term for a group of symptoms - memory loss, confusion, language trouble, and changes in judgment or behavior - caused by damage to brain cells. It is not a normal part of aging, and it is not one single disease. An estimated 6.7 million Americans aged 65 and older are living with Alzheimer's, the most common form ([Alzheimer's Association](https://www.alz.org/alzheimers-dementia/facts-figures), 2024). This guide explains what dementia is, how doctors diagnose it, and the differences between the most common types so your family can plan with clarity. ## What exactly is dementia, and how is it different from normal aging? Forgetting where you parked is normal. Forgetting that you drove is not. Dementia describes a decline in thinking skills severe enough to interfere with daily life, and it stems from physical changes in the brain ([National Institute on Aging](https://www.nia.nih.gov/health/alzheimers-and-dementia/what-dementia-symptoms-types-and-diagnosis), 2024). **Dementia** An umbrella term for symptoms - memory loss, impaired reasoning, language difficulty - caused by disease or injury to the brain. **Alzheimer's disease** The most common cause of dementia, marked by amyloid plaques and tau tangles in the brain. **Mild cognitive impairment (MCI)** Cognitive changes that are noticeable but don't yet disrupt daily independence; some, but not all, cases progress to dementia. If you're still in the noticing-changes stage, our overview of the [Early Signs of Dementia: 10 Symptoms Families Notice First](/early-signs-of-dementia-10-symptoms-families-notice-first/) walks through what to watch for before a diagnosis. ## Why does understanding dementia matter for the whole family? As Teepa Snow, dementia care educator and founder of Positive Approach to Care, often reminds families: when caregivers don't learn the skills to cope, they create their own distress cycle - poor sleep, chronic stress, and burnout that can raise their own health risks. Snow's three reasons families need dementia education: - People are living longer, and age is the single biggest risk factor for dementia. - Untreated [caregiver stress](/resources/blog/how-to-manage-caregiving-frustration-with-grace-and-grit/) raises the caregiver's own risk of chronic illness, including dementia. - Learning what works shifts the experience from frustration to confidence. Roughly 1 in 3 caregivers of people with dementia report their own health has gotten worse since taking on the role ([Alzheimer's Association](https://www.alz.org/alzheimers-dementia/facts-figures), 2024). Education is not optional - it's protective. ## How do doctors actually diagnose dementia? There is no single dementia test. Diagnosis is a process that pieces together history, exams, lab work, and imaging ([Mayo Clinic](https://www.mayoclinic.org/diseases-conditions/dementia/diagnosis-treatment/drc-20352019), 2024). For a deeper walk-through, see our guide on [Alzheimer's Tests: How Doctors Diagnose It in 2024](/resources/blog/suspect-alzheimers-tips-and-tests-for-detection/). - **Medical and family history** - including a frank conversation with someone who knows the person well. - **Cognitive screening** - short tests like the MoCA or Mini-Cog that assess memory, language, and reasoning. - **Bloodwork** - to rule out thyroid disease, B12 deficiency, or infection that can mimic dementia. - **Brain imaging** - CT or MRI to look for strokes, tumors, or atrophy; PET scans can detect amyloid. - **Specialist referral** - to a neurologist, geriatrician, or memory clinic when the picture is unclear. For example, an 84-year-old who began missing her own grandchildren's names was found, after bloodwork, to have severe B12 deficiency - reversible with injections. That's why ruling out treatable causes matters before assuming the worst. ## What are the most common types of dementia? Each type damages the brain differently, which is why care plans aren't interchangeable. TypeShare of casesHallmark symptomsTypical onset Alzheimer's disease60-80%Memory loss, word-finding trouble, disorientationAge 65+ [Vascular dementia](/resources/blog/vascular-dementia/)~10%Slowed thinking, planning trouble, stepwise declineAfter stroke or small-vessel disease Lewy body dementia5-10%Visual hallucinations, fluctuating alertness, Parkinson-like movementAge 50+ Frontotemporal dementia~10% of under-65 casesPersonality and behavior change, language lossAge 45-64 Mixed dementiaVery common in 80+Overlap of Alzheimer's and vascular changesAge 75+ Source: ([Alzheimer's Association](https://www.alz.org/alzheimers-dementia/what-is-dementia/types-of-dementia), 2024). Vascular changes often coexist with Alzheimer's pathology, which is why [understanding vascular dementia](/resources/blog/what-is-vascular-dementia-understanding-the-second-most-common-type-of-dementia/) matters even after an Alzheimer's diagnosis. ## What about rarer forms - and dementia in people under 65? **Alcohol-related dementia** and Wernicke-Korsakoff syndrome stem from heavy long-term drinking and thiamine deficiency. About 75% of people with alcohol-related dementia experience some degree of recovery when alcohol use stops and nutrition is restored ([Alzheimer's Society](https://www.alzheimers.org.uk/about-dementia/types-dementia/alcohol-related-brain-damage-arbd), 2024). Our article on [whether alcohol causes dementia](/resources/blog/does-alcohol-cause-dementia/) goes deeper. **Parkinson's disease dementia** develops in some people years after motor symptoms appear. **Creutzfeldt-Jakob disease** is rare and progresses in months rather than years ([NINDS](https://www.ninds.nih.gov/health-information/disorders/creutzfeldt-jakob-disease), 2024). **Huntington's disease** is inherited and typically appears between ages 30 and 50. **Early-onset dementia** affects people under 65 and is often misread as depression or burnout. Consider a 58-year-old executive whose colleagues notice he can no longer follow meetings he used to lead - that's a scenario that warrants a neurology referral, not a vacation. ## What should families do after a diagnosis? As geriatrician Louise Aronson, MD, author of *Elderhood*, frames it: the goal isn't to fight aging but to age well, with care that fits who the person has always been. Practical first steps: - **Stabilize the legal basics** - durable [power of attorney](/resources/blog/how-to-find-right-lawyer-for-power-of-attorney/) and a healthcare proxy while the person can still sign (AARP, 2024). - **Build the care circle** - primary doctor, neurologist, social worker, and at least two family decision-makers. - **Plan for safety** - driving evaluation, stove shut-offs, medication management. - **Learn the communication shifts** - shorter sentences, fewer choices, validation over correction. If you're weighing what level of support fits today, our team can help you compare options - from light support at home to specialized memory care in [Life's Neighborhood®](https://www.aegisliving.com/services/memory-care/). [Contact Aegis Living](/contact/) or [find a community near you](/find-a-location/) to talk through next steps. ## Frequently asked questions ### Is dementia the same as Alzheimer's disease? No. Dementia is the umbrella term for symptoms; Alzheimer's is the most common disease that causes those symptoms, accounting for 60-80% of cases ([Alzheimer's Association](https://www.alz.org/alzheimers-dementia/facts-figures), 2024). A person can have dementia from vascular, Lewy body, or frontotemporal causes instead of, or alongside, Alzheimer's. ### How long does someone live after a dementia diagnosis? It varies by type and age at diagnosis. Average life expectancy after an Alzheimer's diagnosis is roughly 8 to 10 years, though some live 20 years and others much less ([National Institute on Aging](https://www.nia.nih.gov/health/alzheimers-and-dementia/what-alzheimers-disease), 2024). Frontotemporal and Creutzfeldt-Jakob disease typically progress faster. ### Can dementia be reversed? Most dementias cannot be reversed, but conditions that mimic dementia - B12 deficiency, thyroid disease, depression, medication side effects, normal pressure hydrocephalus - sometimes can ([Mayo Clinic](https://www.mayoclinic.org/diseases-conditions/dementia/symptoms-causes/syc-20352013), 2024). That's why a thorough workup matters before accepting a diagnosis. ### What is the difference between memory care and assisted living? Assisted living supports daily activities like bathing and medication; memory care adds secured environments, dementia-trained staff, and structured programming designed for cognitive impairment. Many families start with assisted living and move to memory care as needs change. ### When is it time to consider memory care? Common triggers include wandering, leaving the stove on, falls, weight loss, social withdrawal, or caregiver exhaustion. If safety at home requires near-constant supervision, a memory care community is usually the more sustainable option for both the person and the family. ### Does insurance pay for dementia care? Medicare covers diagnosis, doctor visits, and short-term skilled care but does not pay for long-term custodial care in assisted living or memory care ([Medicare.gov](https://www.medicare.gov/coverage/long-term-care), 2024). Long-term care insurance, veterans benefits, and Medicaid (in some states) may help.