5 Early Warning Signs of Dementia That May Show Up Before Memory Problems, Experts Say

When people think about dementia, memory loss is often the symptom that comes to mind first. But experts caution that shifts in sleep, personality, behavior, and everyday functioning can sometimes appear before forgetfulness becomes obvious.

Spotting these early clues matters because noticing possible cognitive changes sooner can help people get medical attention and the right support. While occasional forgetfulness and changes in routine can be part of aging, ongoing or unusual changes should not automatically be written off as normal.

Neuorsurgeon Dr. Betsy Grunch says some less obvious symptoms can provide important hints that brain health may be affected. Below are five early signs of dementia to watch for, including issues that can surface before major memory problems do.

1. Major Changes in Sleep

Sleep naturally changes as people age, but sudden or dramatic shifts may be a warning sign.

Dr. Grunch says some people in the early stages of dementia start waking up very early, such as around 3 a.m., or feel unusually sleepy during the day even after getting enough rest. This may happen because some of the brain areas that control sleep are among the first to be affected by Alzheimer's disease.

“Sleep disorders are common as we get older, but dramatic changes in someone's sleep habits can be a sign of dementia,” she says.

Researchers have increasingly linked sleep quality with brain health, which is why unusual sleep problems should not be overlooked.

2. Personality Shifts

One of the most missed warning signs has little to do with memory.

According to Dr. Grunch, noticeable personality changes may appear early in the disease process. A person who was once outgoing and social may become withdrawn, lose interest in activities they used to enjoy, or stop spending time with friends and family.

“They may become more withdrawn and not go out with their friends as much,” she explains.

As cognitive decline continues, people may also become less organized, have trouble finishing household chores, or struggle to keep up with responsibilities at work. Because these changes often happen gradually, loved ones are frequently the first to notice them.

3. Trouble Driving

Driving is a highly complex task that depends on memory, attention, reaction time, judgment, and visual processing. Since so many parts of the brain are involved, changes behind the wheel can sometimes point to cognitive decline.

Dr. Grunch says warning signs can include minor crashes, unexplained marks on the car, taking turns too sharply, or braking and accelerating in an uneven way.

Some people may also start avoiding nighttime driving or feel uneasy when driving with passengers.

“Driving is actually a really complex behavior,” she notes. “Changes in one's cognition can be demonstrated in difficulty with driving.” Although conversations about driving can be difficult, experts say addressing concerns early may help prevent accidents and keep everyone safer.

4. Difficulty With Words or Conversations

Problems communicating can sometimes be an early sign of cognitive decline, even before memory loss becomes clear.

A person in the early stages of dementia may struggle to find the right words, pause often in the middle of sentences, repeat themselves, or have trouble following conversations.

They may also find it hard to understand complex instructions or keep up when several people are speaking at once. Experts say these communication issues can happen when brain changes begin to affect language processing and other cognitive skills.

While forgetting a word now and then is normal, regularly struggling to express thoughts or follow discussions may be worth discussing with a healthcare professional.

5. Poor Judgment and Unusual Choices

Changes in judgment and decision-making can also show up before obvious memory problems.

Someone experiencing early cognitive decline may begin making unusual financial decisions, falling for scams, neglecting personal hygiene, or having trouble judging everyday risks. They may also struggle with planning, organizing, or thinking through the consequences of their actions.

These shifts can be especially concerning when they are clearly different from a person’s usual behavior.

Because judgment depends on several cognitive abilities, including reasoning and problem-solving, ongoing difficulties in these areas may be worth bringing up with a doctor.