What is Behavioral Variant Frontotemporal Dementia (bvFTD)?
Behavioral variant frontotemporal dementia (bvFTD) is the most common type of frontotemporal dementia (FTD), accounting for about half of all FTD cases. It is sometimes also called frontotemporal dementia or Pick’s disease.
What makes bvFTD different from many other dementias is that the earliest changes usually involve personality, behavior, and social awareness, rather than memory. A person may begin acting very differently from how they used to, sometimes in ways that are confusing or upsetting for family and friends.
People living with bvFTD may experience:
noticeable personality changes
loss of motivation or interest
difficulty showing empathy or concern for others
challenges with judgment, self-control, and socially appropriate behavior
Unlike conditions such as Alzheimer’s disease, memory can remain relatively intact in the early stages. Another important aspect of bvFTD is that individuals often do not recognize the changes in their own behavior, or may not realize how their actions affect the people around them.
In some cases, symptoms of bvFTD can overlap with conditions that mainly affect movement, including:
Progressive supranuclear palsy (PSP)
Corticobasal syndrome (CBS)
Amyotrophic lateral sclerosis–FTD spectrum disorder (ALS-FTSD)
Recognizing the Signs and Symptoms
The symptoms of bvFTD can appear in many different ways. Not everyone will experience all of them, but the following changes are common.
Disinhibition
This refers to losing the ability to follow normal social boundaries, which can lead to impulsive or inappropriate behavior. Examples include:
making rude or offensive comments that are out of character
ignoring other people’s personal space
reckless spending or shoplifting
touching strangers or inappropriate sexual behavior
sudden angry or aggressive outbursts
Apathy
Many people with bvFTD experience a loss of motivation or interest in things that once mattered to them. This may look like:
withdrawing from work, hobbies, or relationships
neglecting personal hygiene
difficulty starting or completing tasks
Emotional Blunting
A person may appear less emotionally responsive or have difficulty understanding how others feel. This can include:
seeming indifferent to important events (such as the loss of a loved one)
not noticing when family members are upset or distressed
Repetitive or Compulsive Behaviors
Some people develop strong routines or repeated behaviors, such as:
repeating the same words or phrases
hand rubbing, clapping, or other repetitive movements
reading the same book again and again
hoarding objects
walking to the same place at the same time each day
Changes in Eating or Drinking
Eating habits may shift significantly. Examples include:
binge eating
strong cravings for carbohydrates or sweets
eating only certain foods
excessive drinking (water or alcohol)
increased or new tobacco use
attempting to eat non-food items
Difficulty with Planning and Decision-Making
bvFTD often affects executive function, the brain’s ability to organize and manage tasks. This can result in:
trouble planning daily activities
poor judgment with finances
unusual mistakes at work
Other Possible Changes
Additional symptoms may include:
pacing or restlessness
sudden mood changes
irritability or emotional instability
lack of insight into behavior
Sometimes a person may blame others for the consequences of their actions, for example, blaming someone else for losing a job or become angry when others try to limit risky behavior.
Diagnosis
Diagnosing bvFTD can be difficult, especially in the early stages. Because many doctors are unfamiliar with the condition, it is often mistaken for other disorders, including:
depression or other psychiatric conditions
Alzheimer’s disease
Parkinson’s disease
vascular dementia
substance or alcohol misuse
If you are concerned about these symptoms in yourself or someone you care about, it is important to speak with a medical professional, ideally one who has experience with neurodegenerative conditions.
Doctors usually make the diagnosis based on:
medical history and observed symptoms
cognitive and behavioral evaluations
brain imaging to look for changes in the front and side regions of the brain
Currently, there is no single test or biomarker that can definitively confirm bvFTD during life.
Treatment, Support, and What to Expect
The progression of bvFTD varies from person to person. Over time, behavioral and cognitive symptoms usually become more noticeable, and daily activities may become harder to manage independently.
Many individuals eventually require additional support or specialized care.
At this time:
there is no cure for bvFTD
treatments cannot usually stop the disease from progressing
Genetics
For many people, FTD occurs without a known family history. This is called sporadic FTD. However, about 40% of people with FTD have a family history of a neurodegenerative disease. In these cases, the condition may be familial, meaning it runs in families.
Researchers have identified several genes linked to bvFTD, including:
MAPT
GRN
C9orf72
Overall, about 10–30% of bvFTD cases are caused by genetic changes. Genetic testing may help confirm the diagnosis when a hereditary form is suspected.
✅ If you’re worried about behavioral or personality changes in yourself or someone you love, trust your instincts and speak with a healthcare professional. Early evaluation can help families better understand what is happening and plan for support.
