What dementia is and how it affects people

Dementia is not one single disease and it is not a normal part of ageing. It is a term used to describe a group of symptoms caused by diseases that damage the brain, such as Alzheimer's disease, vascular dementia, dementia with Lewy bodies, and frontotemporal dementia.

Dementia affects people in different ways. It may cause problems with memory, attention, language, planning, judgement, orientation, perception, mood, behaviour, and the ability to carry out everyday tasks. Symptoms usually get worse over time, but the speed and pattern of change vary from person to person.

How dementia may affect daily life

• Memory and orientation: the person may forget recent events, lose track of time, or be unsure where they are.
• Communication: they may struggle to find words, follow a conversation, or understand long explanations.
• Decision-making: choices that were once simple may become harder, especially when there is pressure or too much information.
• Perception and reasoning: they may misinterpret what they see or hear, or become frightened by unfamiliar surroundings.
• Everyday function: dressing, washing, eating, walking safely, and taking medicines may gradually need more support.

Important reminders for care staff

Not every difficulty in an older person is caused by dementia. A sudden change in confusion, alertness, mobility, continence, sleep, or behaviour may suggest illness, pain, delirium, medication effects, or another problem that needs review.

Dementia can also affect younger adults, although this is less common. Staff should avoid assuming dementia always looks the same, always progresses at the same speed, or always begins with memory problems alone.

Dementia is a broad syndrome that affects thinking, communication, orientation, and daily life in different ways. Good care starts with understanding both the condition and the individual person.