What to expect

How quickly do things change?

Faster than in most brain illnesses. The CDC and the NHS both say that most people die within a year of symptoms starting, and the CDC describes the course as months to a year. Some people have longer, and the inherited forms in particular can run a different course. No one can tell a family in advance how much time there will be.

What usually happens, and in what order?

The Alzheimer’s Society describes early symptoms as minor memory loss, mood changes and apathy. Within weeks, many people become clumsy and confused, with unsteadiness and slow or slurred speech. Later come jerky movements, shakiness, stiff limbs and incontinence, and eventually the loss of the ability to move or speak. By that stage the person is unlikely to be aware of their surroundings or difficulties.

The NHS lists the same ground: loss of memory and intellect, personality changes, loss of balance and coordination, slurred speech, vision problems, abnormal jerking movements, and progressive loss of brain function and mobility. Infection is a common cause of death, because being unable to move raises that risk.

Not everyone follows this order. Vision or balance may go first in some people, and behaviour or sleep in others.

What can be done at each stage?

Quite a lot, even though nothing stops the illness itself. The jerky movements, called myoclonus, are treated when they interfere with care or cause distress, and medicines exist for them. Agitation is first looked at for an unmet need, such as pain, thirst or needing the toilet, before anything else. Pain is assessed with help from the people who know the person, since they notice what a scale cannot.

Swallowing changes are handled with speech and language therapy, balancing the pleasure and safety of eating. Eating and swallowing covers that in more detail.

Where are people cared for?

In the UK, figures from the National Prion Monitoring Cohort cited in the 2026 recommendations show that 28 percent of people with prion disease die at home, 28 percent in a hospice, 23 percent in a residential or nursing home and 21 percent in hospital. All four are places where good care happens, and families often move between them as needs change.

Palliative and hospice care explains how those teams work and when to call them.

What helps the family through it?

Having the team in place before each change arrives, rather than after. Writing down questions as they come. Accepting practical help when it is offered. Talking to someone who has been through it, which is what the country support groups exist for, listed at support groups by country.

Children in the family will notice what is happening, and talking with children has a way in. Some families also want to know about autopsy and brain donation, which is usually discussed gently and in good time.

For a fuller clinical account, see what to expect: more detail.

What any one person will experience, and when, is a question for the treating team, who know the person and the test results.