A dementia diagnosis can leave families unsure about what comes next. One person may struggle with recent memories, while another first experiences changes in behaviour, language or movement.
Dementia is an umbrella term for symptoms caused by different conditions affecting the brain. These symptoms interfere with everyday life and may involve memory, thinking, communication or behaviour. Dementia is not a normal part of ageing.
This guide explains four common types and how they can differ. It can help you prepare questions for a doctor, but symptoms alone cannot confirm a diagnosis.
How the Type of Dementia Shapes Support
The underlying condition can influence which symptoms appear first, how they change, and which treatments or support strategies may help.
However, a diagnosis does not tell the whole story. Two people with the same type of dementia may have different abilities, preferences and care needs.
Some people also have more than one underlying condition, known as mixed dementia. Support should therefore reflect the person’s current needs rather than assumptions about their diagnosis.
Alzheimer’s Disease and Changes in Memory
Alzheimer’s disease is the most common cause of dementia. It is associated with changes in the brain involving amyloid and tau proteins, alongside damage to brain cells.
Difficulty remembering recent events or learning new information is often an early sign. A person may repeat a question, forget a recent conversation, or find it harder to follow a familiar task.
Other changes can include:
- Difficulty finding words
- Becoming confused about time or place
- Problems with planning and decision-making
- Changes in mood or behaviour
- Increasing difficulty managing everyday activities
Not everyone experiences memory loss first, and symptoms do not follow an identical pattern.
Alzheimer’s is more common in older adults, but it can occur before 65. This is called younger-onset Alzheimer’s disease. Families may need to consider employment, finances, and parenting responsibilities alongside care.
Vascular Dementia and Changes in Thinking
Vascular dementia results from damage linked to problems with the brain’s blood supply. It may follow a stroke, several smaller strokes or disease affecting small blood vessels.
The symptoms depend on where the damage occurs. Some people have prominent memory difficulties, while others first struggle with concentration, planning or processing information.
Possible symptoms include:
- Slower thinking
- Difficulty organising tasks or making decisions
- Reduced attention and concentration
- Problems finding words
- Changes in walking or balance
- Memory difficulties
- Changes in mood or behaviour
Progression can be gradual or occur in noticeable steps, sometimes following another stroke. It should not be described simply as occasional bursts of confusion.
Managing blood pressure, diabetes, cholesterol and other vascular risk factors is important. A doctor can advise on appropriate treatment for the individual.
Lewy Body Dementias and Fluctuating Symptoms
“Lewy body dementias” includes two related conditions: dementia with Lewy bodies and Parkinson’s disease dementia. Both are associated with abnormal collections of a protein called alpha-synuclein in brain cells.
In dementia with Lewy bodies, difficulties with attention, visual perception or movement may appear before obvious memory loss.
Common features can include:
- Noticeable fluctuations in alertness and attention
- Repeated visual hallucinations
- Slowed movement, stiffness or a shuffling walk
- Sleep disturbances, including acting out dreams
- Difficulty judging distances or interpreting visual information
Parkinson’s disease dementia develops in someone who already has established Parkinson’s disease.
An accurate diagnosis matters because some people with Lewy body dementia can have severe reactions to certain antipsychotic medicines. Medication decisions need careful clinical review. Families should tell treating professionals about the diagnosis and should not change medicines without medical advice.
Frontotemporal Dementia and Changes in Behaviour or Language
Frontotemporal dementia is a group of conditions affecting the brain’s frontal and temporal lobes. These areas are involved in behaviour, personality and language.
It is an important cause of younger-onset dementia, although it can also affect older people.
Depending on the form involved, early changes may include:
- Behaviour that seems out of character
- Reduced motivation or interest in usual activities
- Difficulty recognising other people’s feelings
- Repetitive actions or rigid routines
- Changes in eating habits
- Trouble finding words, speaking or understanding language
Memory may be less affected early on than it is in typical Alzheimer’s disease, although this is not always the case.
These changes can be upsetting or misunderstood as deliberate behaviour. A specialist assessment can help families understand what is happening and identify suitable support.
Mixed Dementia and Overlapping Symptoms
Mixed dementia means that more than one condition is contributing to a person’s dementia. A common combination is Alzheimer’s disease and vascular dementia.
Symptoms may reflect both conditions, making a simple checklist less useful. A person might have difficulty remembering recent events alongside slower thinking, poor concentration or changes in mobility.
Doctors consider the person’s history, assessments and investigations together. Even after diagnosis, care needs should be reviewed as symptoms change.
A Medical Assessment Provides a Clearer Picture
If you notice ongoing changes in memory, behaviour, language or daily functioning, arrange an appointment with a GP.
An assessment may include a discussion of symptoms, a medication review, physical checks, cognitive testing and investigations such as blood tests or brain imaging. The GP may refer the person to a specialist or memory clinic.
Other conditions can cause or worsen similar symptoms, so it is important not to assume that every change means dementia.
Before the appointment, write down specific examples, when they began, and how they affect daily life. Where the person agrees, someone who knows them well can help explain changes they may not have noticed themselves.
Sudden Confusion Needs Prompt Medical Attention
A sudden change over hours or days should not be dismissed as normal dementia progression.
New confusion, unusual drowsiness or a marked change in behaviour may indicate delirium or another acute illness. This can happen to someone who already has dementia and needs urgent medical assessment.
Call 000 if the person has signs of a stroke, such as sudden facial drooping, arm weakness or speech difficulty, or is seriously unwell.
Everyday Care Should Follow the Person’s Needs
Understanding the diagnosis can guide care, but practical support starts with the person’s routines, interests and abilities.
Helpful arrangements may include familiar workers, clear communication, manageable activities and assistance with tasks that have become difficult. The person should remain involved in decisions as much as possible.
Our guide to the stages of dementia explains how support needs may change over time. Families noticing increased restlessness or confusion later in the day can also read about sundowning.
These patterns vary. New or worsening symptoms should still be discussed with a health professional rather than automatically attributed to dementia.
Dementia Support at Home With My Evervale
At My Evervale, we work with families to understand the person’s routines, preferences and day-to-day support needs.
Our home care services can help families explore practical assistance at home alongside care from their treating professionals. We do not diagnose dementia or replace medical advice.
If you would like to discuss care for yourself or a family member, make a referral and our team will get in touch.