You cannot diagnose yourself, but you can recognize when to see a doctor

Forgetting where you put your keys is not dementia. Forgetting that you own keys, or what they do, is different. The line between normal aging and dementia is not something you can draw alone—a doctor has to do it—but you can learn what doctors actually look for, and that knowledge helps you decide whether to make an appointment.

Dementia is not a single disease. It is a pattern of decline in memory, thinking, or behavior that interferes with daily life. Alzheimer's disease causes about 60 to 80 percent of dementia cases. Other causes include vascular dementia (from small strokes), Lewy body dementia, and frontotemporal dementia. A doctor can narrow down the cause only after seeing you in person, running tests, and sometimes ordering imaging. But the first step is recognizing that something has shifted.

Key Takeaways

  • Memory loss that disrupts daily life—forgetting appointments, repeating the same question, getting lost in familiar places—warrants a doctor's visit, even if it seems minor.
  • Normal aging includes occasional forgetfulness; dementia involves a noticeable change from your baseline and affects your ability to manage tasks you used to handle.
  • A primary care doctor can do an initial screening with simple cognitive tests and refer you to a neurologist or geriatrician if needed.
  • Early diagnosis, even if the news is difficult, opens access to treatments that may slow decline and lets you plan while you still can.

Signs that warrant a doctor's visit

Pay attention to changes that are new for you and that affect what you do every day. A person with dementia might forget they already ate breakfast and ask for it again. They might get lost driving a route they have driven for years. They might put the milk in the cupboard or the car keys in the freezer. They might repeat the same story within an hour, or ask the same question five times in one conversation.

Other signs include trouble finding words, difficulty managing money or bills, withdrawing from hobbies or social events, mood or personality changes that seem out of character, poor judgment (like giving money to scams), or neglecting hygiene or home upkeep. Some people become irritable or suspicious. Others become withdrawn or apathetic.

The key is that these changes are noticeable to you or to people close to you, they have been happening for weeks or months (not just one bad day), and they represent a shift from how you normally function. If you have always been forgetful, that is your baseline. If you have always been quiet, that is your baseline. Dementia is a change from your own normal.

What is normal aging and what is not

Healthy older adults forget names, misplace glasses, or walk into a room and forget why. They might take longer to learn something new or need to write things down more often. They might have a slower processing speed. These are common and do not interfere with managing a household, holding a job, or living independently.

Dementia involves memory loss that is severe enough to disrupt work, hobbies, or social life. A person with dementia might forget entire conversations or events, not just details. They might forget the names of close family members. They might be unable to follow a recipe they have made a hundred times, or unable to pay bills they have always paid, or unable to find their way home from a familiar place.

The difference is not the occasional lapse. It is the pattern, the severity, and the impact. If you are worried enough to ask the question, that worry itself is worth taking to a doctor.

How a doctor evaluates memory and thinking

Your primary care doctor can start with a brief screening. The most common is the Montreal Cognitive Assessment (MoCA) or the Mini-Cog, which take 10 to 15 minutes. These are not definitive diagnoses—they are flags that tell a doctor whether to look deeper. You might be asked to remember a short list of words, draw a clock, or answer questions about the date and where you are.

If screening suggests a problem, your doctor will ask about your medical history, current medications (some can affect memory), sleep, mood, and whether family members have noticed changes. They will check for other causes: thyroid problems, vitamin B12 deficiency, depression, medication side effects, or sleep apnea can all mimic dementia symptoms and are sometimes reversible.

A neurologist or geriatrician can do more detailed testing and may order an MRI or CT scan to look for stroke, tumor, or brain shrinkage. Blood tests can rule out infections or metabolic problems. In some cases, a PET scan or spinal tap is used to look for the proteins associated with Alzheimer's disease, though these are not routine.

What happens after a diagnosis

If a doctor concludes you have dementia, they will try to identify the type, because treatment depends on the cause. Alzheimer's disease has medications (like donepezil or memantine) that may slow cognitive decline in early stages, though they do not stop the disease. Vascular dementia might be managed by treating high blood pressure or cholesterol to prevent more strokes. Other types have different approaches.

A diagnosis also opens the door to planning. You can discuss driving safety with your doctor. You can talk to a lawyer about power of attorney or advance directives while you are still able to make decisions. You can tell your family and your employer. You can join a support group. You can explore whether clinical trials for new treatments are available to you. None of this is easy, but all of it is easier to do early.

If the diagnosis is mild cognitive impairment (MCI)—a middle ground between normal aging and dementia—your doctor will monitor you over time. Some people with MCI stay stable for years. Others progress to dementia. Regular follow-up visits help track the pace of change.

When to see a doctor and where to start

Start with your primary care doctor. Call and describe what you have noticed—memory problems, getting lost, trouble with familiar tasks—and ask for a cognitive screening. You do not need a referral to see your own doctor, and most insurance plans cover this visit.

If your primary care doctor finds something concerning, they will refer you to a neurologist, geriatrician, or memory clinic. Some health systems have dedicated memory clinics that specialize in dementia diagnosis. If you do not have a primary care doctor, you can contact your local Area Agency on Aging (find yours at eldercare.acl.gov) and ask for a referral to a doctor who does cognitive screening.

Bring someone with you to the appointment if you can—a family member or close friend. They can help describe changes you might not notice in yourself, and they can help you remember what the doctor said. Write down your symptoms and when they started before you go.

What to do if you are worried but not ready to see a doctor

If you are hesitant, consider what you are afraid of. Many people delay because they fear a diagnosis will mean losing independence or being put in a home. That is not how it works. A diagnosis does not change your legal rights or your ability to make decisions (unless a court orders otherwise, which is rare). It gives you information and options.

Others delay because they think memory loss is just part of aging and nothing can be done. That is not always true. Some causes of memory problems are reversible. Even when they are not, early treatment can slow decline. And knowing what you are dealing with lets you plan, prepare, and get support before crisis hits.

If cost is a barrier, many communities offer free or low-cost cognitive screening through senior centers, health departments, or nonprofits. Call your local Area Agency on Aging to ask what is available in your area.

Frequently Asked Questions

Can stress or depression cause memory problems that look like dementia?

Yes. Depression, anxiety, and chronic stress can all affect memory and concentration. A doctor can distinguish between depression-related memory problems and dementia through screening and sometimes through a trial of antidepressant medication. This is one reason it is important to see a doctor rather than assume the worst.

If I have one parent with dementia, will I definitely get it?

Not necessarily. Having a family history increases risk for some types of dementia, especially early-onset Alzheimer's disease, but it does not may provide you will develop it. Managing high blood pressure, staying mentally and physically active, maintaining social connections, and getting quality sleep all reduce dementia risk.

What if my doctor says it is just normal aging and I am still worried?

You can ask for a second opinion or a referral to a specialist. You can also ask your doctor to monitor you with repeat screening in six months or a year. If changes continue, that pattern will be visible and will support a referral to a neurologist or memory clinic.

Can I test myself at home to see if I have dementia?

Online cognitive tests exist, but they are not reliable for diagnosis. They cannot account for your baseline, your education, your language, or other factors that affect performance. A doctor-administered test in person, combined with a medical history and physical exam, is the only way to get a meaningful answer.

How long does it take to get a dementia diagnosis?

A primary care screening takes one visit. If your doctor refers you to a specialist, you might wait weeks for an appointment depending on demand in your area. The specialist may need to order tests, which adds time. From first concern to final diagnosis can take anywhere from a few weeks to several months.