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Tash11e t1_j26ajlj wrote

There are a range of types of dementia, and they all look slightly different on scans of the brain (often MRI's) and might have different signs from blood or other tests that differentiates the types from each other.

The different types also effect people's function slightly differently, and both family history and just general life history can help with determining the type of dementia. For example, if someone is known to have had a history of alcohol excess they might be more likely to develop an alcohol related form of dementia so that might be the starting point for investigations.

Alzheimer's is the most common hence being the one most people are aware of.

The other main types are:

Frontotemporal dementia, which often develops slightly younger and can lead to quite significant personality changes and challenging behaviours (among other things).

Lewy Body dementia, which can often present quite similarly to Parkinson's disease.

Vascular dementia, which is often correlated with multiple strokes or other vascular (blood flow) changes to the brain. The functional impacts to a person can often depend on which part of the brain is most impacted.

Mixed dementia, which is essentially a combination of types.

But that isn't an exhaustive list and there are other less common types, and yes most of them have names.

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-----shreddit----- t1_j27zpvm wrote

My mum has parkinsons and has both visual and auditory hallucinations, plus she is super paranoid all the time.
She has the odd hour or so of clarity, but lately she's been stopping mid sentence because she cant remember words or what she's talking about.
Ive read this is late stage parkinsons but the doctors wont den or confirm this.

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EnricoPin t1_j2azr20 wrote

To make a diagnostic of alzheimer you must first exclude all other causes and all reversible causes of dementia (hypothyroidism, depression, hydrocephalus)

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rcm718 t1_j2b8xbz wrote

Once you've excluded all other causes, it must necessarily be that cause, no?

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EnricoPin t1_j2b9qvv wrote

It’s not that easy, but it’s how we do it.

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