Common Types and Causes of Dementia

Common types and causes of dementia affect many people in South Africa. Dementia is not just one illness. It is a group of conditions that cause problems with memory, thinking, and behaviour. These difficulties make daily life harder. Knowing the types and causes helps us care better for those living with dementia.

Different Types of Dementia and Why They Happen

Dementia happens when brain cells get damaged. This damage affects how the brain works. Different causes lead to different types of dementia. Some types progress slowly, and others develop faster. Here are the main types you should know:

• Alzheimer’s Disease

The most common type of dementia. It happens when abnormal proteins build up in the brain, causing brain cells to die. Memory loss and confusion are early signs.

• Vascular Dementia

Caused by poor blood flow to the brain, often after a stroke or series of small strokes. This type can cause problems with thinking speed, focus, and controlling movements.

• Lewy Body Dementia

Linked to abnormal protein deposits called Lewy bodies in brain cells. It causes memory problems, changes in alertness, and sometimes hallucinations or movement problems like Parkinson’s disease.

• Frontotemporal Dementia (FTD)

Occurs when the front part of the brain shrinks. It mainly affects personality, behaviour, and language, with less memory loss in the early stages.

• Mixed Dementia

When a person has more than one type of dementia, usually Alzheimer’s along with vascular dementia. Symptoms can be a mix of both types.

Main Causes of Dementia

Dementia can start for different reasons. Here are the common causes:

1. Brain Cell Damage: In Alzheimer’s and Lewy Body dementia, harmful proteins damage or kill brain cells.
2. Reduced Blood Flow: Strokes or blocked blood vessels reduce oxygen supply to the brain, causing vascular dementia.
3. Genetics and Age: Older age increases risk. Some types of dementia run in families.
4. Health Conditions: High blood pressure, diabetes, high cholesterol, and smoking raise dementia risk by damaging blood vessels and brain cells.
5. Infections and Head Injuries: Some infections and serious head injuries can lead to dementia in some cases.

Understanding common types and causes of dementia helps people recognise symptoms early. Early diagnosis can improve care and quality of life for those affected. It also guides families and caregivers in offering the best support and treatment.