There are two main types of Alzheimer’s disease:
Early-onset Alzheimer’s disease: This type of Alzheimer’s occurs before the age of 65 and is relatively rare, accounting for less than 10% of all cases. It is linked to genetic mutations that can be inherited from a parent, and symptoms tend to progress rapidly.
Late-onset Alzheimer’s disease: This is the most common type of Alzheimer’s and occurs after the age of 65. It is not directly linked to genetic mutations but can be associated with other risk factors such as age, genetics, lifestyle choices, and medical conditions.
There are also several subtypes of Alzheimer’s disease based on the underlying pathology seen in the brain. These subtypes include:
- Amyloid-positive Alzheimer’s: This subtype is characterized by the presence of beta-amyloid plaques in the brain, which disrupt communication between brain cells.
- Tau-positive Alzheimer’s: This subtype is characterized by the accumulation of tau protein in the brain, which forms tangles that interfere with cellular functioning.
- Limbic-predominant age-related TDP-43 encephalopathy (LATE): This new subtype of Alzheimer’s is characterized by the accumulation of TDP-43 protein that starts in the brain’s temporal lobe and moves to other parts of the brain, causing decline in memory and cognitive function.
*It’s important to note that these subtypes are still being studied and further research is needed to fully understand their implications for diagnosis and treatment.