Question

What is brain tumour? How it is caused?

Answer 1

When cancer cells from other parts of your body cause a tumor in your brain, it is called a “secondary” or “metastatic brain tumor.” Secondary brain tumors are three times more common than primary brain tumors. All secondary brain tumors are malignant.

Answer 2

a brain tumour is a collection of abnormal cells in the brain.
they can be cancerous or non-cancerous.
primary tumours orginate in the brain.
secondary tumours are those which result from cancer.
but doctors are not clear about the causes of brain tumour.
hope it helps u.....