Behavioral symptoms

Apathy is often the first symptom reported by caregivers and may be mistaken for depression. People experiencing these changes may become self-centered, emotionally distant, withdrawn, unaware of the emotions of others, avoid social contact or neglect previous hobbies and interests. They may develop a lack of concern for their personal appearance and become increasingly unkempt early in the course of disease.

Impulsive behavior is another common complaint from caregivers who may find the changes in social and personal conduct embarrassing or frustrating. These behaviors are often associated with a lack of inhibition, resulting in impulsive or inappropriate behavior, such as overeating, outbursts of frustration, touching strangers, urinating in public or diminished social tact. Overeating is common and "food fads" can occur where the person with bvFTD will only eat certain foods. Caregivers often notice an overactive "sweet tooth." Restlessness, irritability, aggressiveness, violent outbursts or excessive sentimentality are not unusual either.

There is usually difficulty in reasoning, judgment, organization and planning, and consequently, these patients can be quite gullible and fall prey to scams on the computer or in person. As the disease progresses, this lack of judgment may lead to criminal behavior (such as shoplifting, indecent exposure, running stop lights, poor financial judgment or impulsive buying). At the extreme, the impulsivity can be self-destructive, as when patients try to get out of a moving car. In some people, inappropriate sexual behavior occurs.

There may also be repetitive or compulsive behaviors that may include hoarding, doing the same thing over and over (for instance, reading the same book several times or walking to the same location again and again), pacing, or repeating particular "catch phrases" over and over in their speech.

The person with bvFTD may experience false thoughts (delusions) that are jealous, religious or bizarre in nature. Or they can develop a euphoria - excessive or inappropriate elation or exaggerated self-esteem.

Even though they might complain of memory disturbance, patients with the behavioral variant of frontotemporal dementia can usually keep track of day-to-day events and understand what is going on around them. Also, for people with bvFTD, their language skills and memory usually remain intact until late in the disease.

These behaviors have a physical cause and are not something that the person can usually control or contain. Indeed, often the person has little or no awareness of the problem behaviors.