Understanding Alzheimer's Disease: The Most Common Form of Dementia

"I thought it was just normal aging."

It's one of the most common things I hear from families.

Maybe Mom forgot a birthday.

Dad started asking the same question several times in one afternoon.

Someone who had always managed the family finances suddenly seemed overwhelmed by simple decisions.

At first, these moments are easy to explain away.

"We all forget things."

And it's true—we do.

As we age, occasional forgetfulness is normal.

Alzheimer's disease is different.

It isn't simply forgetting where you left your keys.

It's a progressive disease of the brain that slowly changes memory, thinking, problem-solving, and eventually a person's ability to manage everyday life.

Understanding what is happening inside the brain doesn't take away the diagnosis.

But it often replaces fear with something much more helpful...

Understanding.

What Is Alzheimer's Disease?

Alzheimer's disease is the most common cause of dementia, accounting for approximately 60–80% of all dementia cases.

One of the biggest misconceptions is that Alzheimer's disease and dementia are the same thing.

They aren't.

Dementia is an umbrella term that describes changes in memory, thinking, and daily functioning that interfere with everyday life.

Alzheimer's disease is one of several diseases that can cause dementia.

Think of dementia as the symptom.

Alzheimer's is one possible cause.

Researchers now know that Alzheimer's begins many years before a person ever notices symptoms.

Abnormal proteins slowly build up in the brain and interfere with how brain cells communicate with one another. Over time, those brain cells become damaged and begin to die.

Because these changes usually begin in the brain's memory center, the earliest signs often involve short-term memory.

This process happens gradually.

Sometimes so gradually that families don't recognize what's happening until they begin looking back.

What Are the Early Signs?

Every person's experience is unique.

But there are some common changes families often notice during the early stages.

A loved one may:

• Ask the same questions repeatedly.
• Forget recent conversations or appointments.
• Misplace everyday items and struggle to find them.
• Have difficulty following recipes or managing finances.
• Lose track of dates or become confused about time.
• Have trouble finding the right words during conversations.
• Show changes in judgment or decision-making.
• Become more anxious, withdrawn, or easily frustrated.

Many people living with early Alzheimer's disease recognize these changes themselves.

Imagine noticing that your memory isn't as reliable as it once was.

Imagine working twice as hard to keep up with conversations or trying to hide your forgetfulness from family and friends.

That can be exhausting.

It's also why some people begin withdrawing from social situations they once enjoyed.

What This Means for Caregivers

One of the hardest parts of Alzheimer's disease is understanding that the behaviors you see are symptoms of changes happening in the brain.

If your loved one asks the same question five times, they aren't trying to frustrate you.

Their brain may no longer be storing the answer.

If they forget a conversation you had earlier that morning, they aren't choosing not to remember.

The disease is making it difficult for new memories to stick.

When we understand why these things happen, it often changes how we respond.

Instead of correcting...

We begin reassuring.

Instead of arguing...

We begin comforting.

Instead of expecting them to remember...

We learn new ways to support them with patience and compassion.

Understanding the disease doesn't make caregiving easy.

But it often makes caregiving feel less confusing.

How Alzheimer's Affects the Family

An Alzheimer's diagnosis doesn't only affect the person living with the disease.

It changes the entire family.

A spouse may gradually take over household responsibilities.

Adult children often begin helping with finances, medications, transportation, and medical appointments.

Roles slowly begin to change.

So do relationships.

Many caregivers also experience something they weren't expecting.

Grief.

Not because their loved one is gone.

But because things are changing.

You may grieve the conversations you used to have.

The trips you planned together.

The independence your loved one is slowly losing.

This is often called anticipatory grief—mourning the changes that are happening while the person you love is still here.

It is one of the most common experiences among dementia caregivers.

And it deserves compassion.

Living with Hope

Receiving an Alzheimer's diagnosis can feel overwhelming.

But it is not the end of the story.

Today's research is helping us diagnose Alzheimer's disease earlier than ever before. New treatments may help slow progression for some people diagnosed in the earliest stages, and researchers continue to make meaningful advances in understanding the disease.

Just as important, we've learned that good dementia care is about far more than medication.

It's about creating routines.

Reducing stress.

Supporting physical health.

Finding meaningful activities.

Learning new ways to communicate.

And preserving dignity and connection every step of the way.

I've watched families continue to laugh together.

I've watched husbands and wives still dance in their kitchen.

I've seen grandchildren bring out smiles no medication ever could.

The disease changes many things.

But it never changes a person's need to feel safe.

To feel valued.

To feel loved.

A Moment for You

If someone you love has recently been diagnosed with Alzheimer's disease, you don't have to learn everything today.

Take one step at a time.

Ask questions.

Accept support.

Give yourself permission to learn as you go.

And remember...

Even as memory changes, love remains one of the most powerful forms of care we can offer.

References

• Alzheimer's Association. 2025 Alzheimer's Disease Facts and Figures.
• National Institute on Aging. What Are the Signs of Alzheimer's Disease?
• Jack CR Jr, et al. Revised Criteria for Diagnosis and Staging of Alzheimer's Disease. Alzheimer's & Dementia. 2024.
• Mielke MM, Fowler NR. Alzheimer disease blood biomarkers: Considerations for Population-Level Use. Nature Reviews Neurology. 2024.