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Alzheimer's Disease Health Center

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Types of Dementia

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Parkinson's Disease Dementia

This type of dementia eventually develops in about 50% to 80% of people with Parkinson's disease, a disorder of the nervous system.

Parkinson's disease dementia is very similar to DLB. They have the same symptoms, and people with both conditions have signs of Lewy bodies in their brains.

On average, the symptoms of dementia develop about 10 years after a person first gets Parkinson's disease.

Mixed Dementia

This is a combination of two types of dementia. The most common combination is Alzheimer's disease and vascular dementia.

Both symptoms and treatment depend on the parts of the brain involved and the types of dementia present.

Frontotemporal Dementia (FTD)

If your loved one has an FTD, he's developed cell damage in areas of the brain that control planning and judgment, emotions, speech, and some types of movement.

The symptoms might include:

  • Personality and behavior changes
  • Sudden lack of inhibitions in personal and social situations
  • Problems coming up with the right words for things when speaking
  • Movement problems, such as shakiness, balance problems, and muscle spasms

Huntington's Disease

This is a brain disorder caused by a genetic defect that's passed through family members. While your loved one might have the gene for Huntington's disease at birth, the symptoms will usually not start to show up until he's between ages 30 and 50.

People with Huntington's get some of the same symptoms seen in other forms of dementia, including problems with:

  • Thinking and reasoning
  • Memory
  • Judgment
  • Planning and organizing
  • Concentration

Creutzfeldt-Jakob Disease

This is a rare condition in which proteins called prions cause normal proteins in the brain to start folding into abnormal shapes. The damage leads to dementia symptoms that happen suddenly and quickly get worse.

The symptoms include:

  • Memory and concentration problems
  • Poor judgment
  • Confusion
  • Mood swings
  • Depression
  • Sleep problems

Your loved one might also have twitching or jerky muscles and trouble walking.

Normal Pressure Hydrocephalus

This type of dementia is caused by a buildup of fluid in the brain. The symptoms include problems walking, trouble thinking and concentrating, and personality and behavior changes.

Some symptoms can be treated by draining the extra fluid from the brain into the abdomen through a long, thin tube, called a shunt.

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