what causes brain tumors#
As the tumor grows, it creates pressure on and changes the function of surrounding brain tissue, which causes signs and symptoms, such as headaches, nausea and balance problems. A brain tumor is a mass or growth of abnormal cells in your brain or close to your brain. Many different types of brain tumors exist.Some brain tumors are noncancerous (benign), and some brain tumors are cancerous (malignant). Brain tumors can begin in your brain (primary brain tumors), or cancer can begin in other parts of your body and spread to your brain (secondary, or metastatic, brain tumors).s the tumor grows, it creates pressure on and changes the function of surrounding brain tissue, which causes signs and symptoms, such as headaches, nausea and balance problems. A brain tumor is a mass or growth of abnormal cells in your brain or close to your brain. Many different types of brain tumors exist.