may affect memory,language, attention, reasoning, judgment, reading and writing.
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causes categories:
- Neurodegenerative. A disorder that gradually destroys brain cells (for example, Alzheimer's disease, dementia with Lewy bodies or frontotemporal dementia)
- Vascular. A disorder that affects the blood vessels of the brain and the supply of oxygen and nutrients vital to brain cells, causing cell damage and death (vascular cognitive impairment)
- Psychiatric. Certain psychiatric conditions that affect memory, concentration and mood (for example, depression)
- Trauma. Physical injury to the brain that also may lead to cognitive difficulties — the potential cause, such as a history of severe head trauma, is usually obvious
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