Secondary brain tumours occur when cancer cells have spread to the brain from a cancer that has started in another part of the body.
The place in the body where a cancer first starts is called a primary tumour.
A secondary tumour occurs when cancer cells break away from the primary tumour and travel through the blood system to another part of the body. When cancer cells spread to another part of the body they are called secondaries or metastases.
Secondary brain tumours can cause the same symptoms as primary brain tumours. It's important to know if a tumour in the brain is a primary or secondary cancer as the two are treated differently.