1. metabolic
   neurodegenerative
2. nutritional

Alzheimer's disease is a neurodegenerative disorder, for which there is no cure. Neurodegenerative diseases are progressive disorders. They cause more than just memory loss -- they cause gradual, ongoing damage to the structure and function of your central nervous systen (that's your brain and spinal cord).

1. yes
2. no

Yes, mixed dementia, as it's known, can happen. It's usually the result of having multiple conditions that all affect your ability to perform cognitive tasks like reasoning and memory recall, but it can only be confirmed during an autopsy.

1. problems with reasoning
   problems with concentration
2. both of these are possible symptoms

To be diagnosed with dementia, a person needs to be having trouble with as few as two of these things: memory; concentration and focus; communication and speech; reasoning; making good judgements; and visual perception.

1. yes, everyone gets it
   yes, once you're older than 50
2. no, no form of dementia is normal

No form of dementia is part of the normal aging experience.

1. inability to perform daily tasks, like paying bills
   personality changes, like suspiciousness
2. these are both symptoms of middle-stage disease

In addition to these symptoms, people living with middle-stage Alzheimer's disease are becoming increasingly confused, forgetful and sometimes angry or delusional. They may not keep up with their hygiene, may have trouble with bladder control and are at an increased risk of wandering.

1. MRI (magnetic resonance imaging)
   memory tests
2. both of these, and more

Doctors use multiple tests to diagnose the different forms of dementia. Alzheimer's disease is diagnosed with attention, language, memory and vision tests, as well as an MRI (magnetic resonance imaging) to see any abnormalities of the brain.

1. yes, they're the same thing
   yes, but Alzheimer's is much worse
2. no, Alzheimer's disease is actually a type of dementia

They're not the same -- Alzheimer's it actually a form of dementia. Dementia itself isn't a diagnosis. Rather, it's an overarching term for different types of conditions that cause symptoms of dementia.

1. Huntington's disease
   Wernicke-Korsakoff Syndrome
2. actually, these are all forms of dementia

While they may be less well-known than Alzheimer's disease, Creutzfeldt-Jakob disease, Huntington's disease and Wernicke-Korsakoff Syndrome are all, also, types of dementia.

1. 25 percent
   66 percent
2. 99 percent

Women make up about 66 percent of Americans living with Alzheimer's disease.

1. Alzheimer's disease
   Parkinson's disease
2. vascular dementia

Stroke is a risk for it, although not everyone who has a stroke will develop vascular dementia. This type develops when the blood supply to the brain becomes blocked.

1. Alzheimer's disease
   dementia with Lewy bodies
2. frontotemporal dementia

Frontotemporal dementia involves the loss of neurons in the front (behind the forehead) and around the sides (behind your ears) of your brain.

1. excessive thirst
   getting lost in a familiar setting
2. poor hygiene

Forgetfulness, even mild, is often one of the very first signs of dementia. As things progress, symptoms like getting lost in a famliar setting and poor hygiene and personal care can develop. But, thirst doesn't have anything to do with dementia.

1. behavior changes
   trouble with speech and language
2. bothof these

Unlike other forms of dementia, memory problems aren't an early sign of FTD. Instead, warning signs of this dementia include personality changes, behavior changes and trouble with speech and language.

1. Alzheimer's disease
   dementia with Lewy bodies
2. Parkinson's disease

Plaques, formed by pieces of protein called beta-amyloid, and tangles, which are twisted strands of a protein called tau, are the hallmark of Alzheimer's disease.

1. Huntington's disease
   Parkinson's disease
2. both of these

Subcortical dementia affects the parts of the brain beneath the cortex, including the basal ganglia and thalamus. The result? An onset of symptoms that include significant impact to concentration, judgment, language, memory and mood, as well as impairment of motor skills (which may begin as something easily-overlooked, like clumsiness).

1. sleep apnea (OSA)
   vitamin B12 deficiency
2. all of these may be reversible

The most common form of dementia, Alzheimer's disease, cannot, at least not currently, be reversed or cured. But some dementias -- including those that are alcohol-related, depression-induced or caused by disorders such as hypothyroidism, HIV and vitamin B12 deficiency -- can be. Doctors use this mnemonic device for remembering the reversible causes: (D)rugs, (e)motional-depression, (m)etabolic, (e)yes and ears, (n)ormal pressure hydrocephalus (t)umor or lesion, (i)nfection, (a)nemia.

1. about 1 million
   almost 10 million
2. almost 1 billion

Of everyone on our planet, 9.9 million people will be diagnosed with a form of dementia every year.

1. Alzheimer's disease
   Frontotemporal dementia
2. Lewy body dementia

Of the different forms of dementia, it's Alzheimer’s disease that's responsible for 50 to 70 percent of all dementia diagnoses. That makes it the most common type.

1. yes, although it may not be the cause of death
   yes, an average of 19 years
2. no, it doesn't

Although it may not be the actual cause of death, having Alzheimer's does shorten a person's life.

1. 1 out of 2
   1 out of 10
2. 1 out of 100

One out of every 10 -- that's 10 percent -- people age 65 or older lives with Alzheimer's disease.

1. 45
   65
2. 75

About five percent of those living with Alzheimer's develop symptoms before age 65 -- which means there are roughly 200,000 people with early-onset disease.

1. 3
   20
2. 50

As many as one out of three Americans die with Alzheimer's disease or a different type of dementia.

1. breast and colon
   breast and pancreatic
2. breast and prostate

Even when you add them together, dementia is responsible for more deaths in the U.S. than the combined total of breast cancer and prostate cancer deaths.

1. about 500,000
   about 5 million
2. about 47 million

According to the World Health Organization (WHO), as many as 47.5 million people on our planet are living with some form of dementia.

1. forgetting where you live
   forgetting things you just learned
2. misplacing your keys

Don't worry if you misplace your keys or forget a name from time to time. That's totally normal. Forgetting where you live, where you are, what year it is, giving away money to scams, though, are warning signs.

1. Alzheimer's disease
   Huntington's disease
2. vascular dementia

These are the symptoms of Huntington's disease, which is caused by a defect in your genes, specifically on chromosome 4.

1. Frontotemporal dementia
   Lewy body dementia
2. dementia doesn't cause hallucinations

Visual hallucinations aren't uncommon in people with Lewy body dementia, especially during the early symptoms of the disease.

1. calcium
   folic acid
2. thiamine

Wernicke-Korsakoff syndrome, a chronic memory disorder, can be the result of a severe thiamine deficiency (that's vitamin B1).

1. Alzheimer's disease and vascular dementia
   vascular dementia and Lewy body dementia
2. Alzheimer’s with vascular dementia and Lewy body dementia

The most common pair of dementias that occur together are Alzheimer's disease and vascular dementia. Following that is Alzheimer's disease and Lewy body dementia, then Alzheimer’s with vascular dementia and Lewy body dementia. Although other types of pairs occur, they aren't as common as these three.

1. amyotrophic lateral sclerosis
   Creutzfeldt-Jakob disease
2. fatal insomnia

Creutzfeldt-Jakob disease is type of transmissible spongiform encephalopathy (TSE), which is also known as a prion disease. It's the most common prion disease that affects humans. Prion diseases like this one are rare progressive conditions that occur when prion proteins malfunction throughout the brain. TSEs are fatal.

1. AIDS Dementia Complex
   Alzheimer's disease
2. Creutzfeldt-Jakob disease

Dementias that are caused by damage to the cortex of the brain can cause problems with a person's cognitive functions, such as trouble with language, motor skills and spacial relationships. Alzheimer's disease, Binswanger's disease, and Creutzfeldt-Jakob disease are examples of cortical dementia.

1. hypothyroidism
   schizophrenia
2. vitamin D deficiency

When you're thyroid's not working correctly, it can disrupt a lot of things about the way your body works -- including causing symptoms of cognitive impairment. Both low and high thyroid-stimulating hormone (TSH) levels can affect the risk, although it's hypothyroidism that is most commonly the problem.

1. it's the sixth-leading cause of death
   it's the No. 1 cause of death
2. neither of these is right

Because it affects more people over the age of 65 than under, Alzheimer's-related deaths are greater in that population. Among the entire U.S. population, Alzheimer's disease is the sixth-leading cause of death.

1. bipolar disorder
   organic brain syndrome
2. post-traumatic stress disorder

Acute organic brain syndrome, also known as delerium, can be confused with dementia because it has similar symptoms.

1. alcohol abuse
   heptatis C
2. opioid abuse

Wernicke-Korsakoff syndrome is caused by a vitamin deficiency and is most commonly caused by alcohol abuse.