Brain tumours cause different symptoms depending on where the tumour is in the brain and how slowly or quickly it grows.
As a tumour grows, it can press on or grow into nearby areas of the brain. This can cause symptoms because it stops that part of the brain from working normally. Symptoms can also happen because the tumour is increasing the pressure inside the skull. This is called raised intracranial pressure.
Symptoms may develop suddenly or slowly over months or even years.