Alzheimer's disease type dementia is a specific brain disease that is a neurodegenerative disease that causes the loss of neurons in the brain, particularly in the cortex.

This damage to brain cells can disrupt processes vital to neurons and their networks, including communication, metabolism, and repair. As the disease progresses, symptoms become more severe and can include confusion, changes in behavior, and other challenges.

Dementia is not a specific disease but is a general term for the impaired ability to remember, think, or make decisions that interfere with everyday activities. It is marked by symptoms of dementia that worsen over time. The disease first affects the part of the brain associated with learning, leading to early symptoms such as changes in memory, thinking, and reasoning skills.

Vascular dementia (VaD) is a condition that affects the brain's ability to think, remember, and behave due to damaged blood vessels that disrupt blood flow and oxygen supply. It's the second most common type of dementia after Alzheimer's disease.

Vascular Dementia is another type of dementia, and when both are present, it is called Mixed Dementia.

Typical personality and behavior changes a person may see include getting upset, worried, and angry more easily. Acting depressed or not interested in things is also common.