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From Care2:
The term dementia is used broadly to describe a condition which is characterized by cognitive decline, but there are many different types of dementia. Although it is usually progressive, properly diagnosing dementia can reverse the effects and be treated and even cured completely by addressing the underlying cause. However, dementia caused by incurable conditions such as Alzheimer’s disease, are irreversible.

Experts estimate that Alzheimer’s disease is the underlying cause of — of all dementia cases. However, there are many other conditions which can also cause dementia, which makes it vital for the patient to obtain accurate diagnosing of dementia early on in order to get proper treatment. Following are some of the most common types of dementia and their causes.

1. Vascular Dementia
The second most common form of dementia, vascular dementia is caused by poor blood flow to the brain, which deprives brain cells of the nutrients and oxygen they need to function normally. One of the ten dementia types, vascular dementia can result from any number of conditions which narrow the blood vessels, including stroke, diabetes and hypertension.

2. Mixed Dementia
Sometimes dementia is caused by more than one medical condition. This is called mixed dementia. The most common form of mixed dementia is caused by both Alzheimer’s and vascular disease.

3. Dementia with Lewy Bodies (DLB)
Sometimes referred to as Lewy Body Disease, this type of dementia is characterized by abnormal protein deposits called Lewy bodies which appear in nerve cells in the brain stem. These deposits disrupt the brain’s normal functioning, impairing cognition and behavior and can also cause tremors. DLB is not reversible and has no known cure.

4. Parkinson’s Disease Dementia (PDD)
Parkinson’s disease is a chronic, progressive neurological condition, and in its advanced stages, the disease can affect cognitive functioning. Not all people with Parkinson’s disease will develop dementia, however. Dementia due to Parkinson’s is also a Lewy body dementia. Symptoms include tremors, muscle stiffness and speech problems. Reasoning, memory, speech, and judgment are usually affected.

5. Frontotemporal Dementia
Pick’s disease, the most common of the frontotemporal dementia types, is a rare disorder which causes damage to brain cells in the frontal and temporal lobes. Pick’s disease affects the individual’s personality significantly, usually resulting in a decline in social skills, coupled with emotional apathy. Unlike other types of dementia, Pick’s disease typically results in behavior and personality changes manifesting before memory loss and speech problems.

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