A tumor is an irregular growth of cells, and can occur in any part of the body, including the brain. Brain tumors are classified into two categories: primary brain tumors, that is, they originate in the brain and begin. And secondary brain tumors, that they arise and begin in another part of the body and develop and move to the brain. They differ in treatment. Not all brain tumors are cancerous, some are benign, and they are not a threat to human life as long as they are removed, they are rarely re-growth, but benign tumors can pose a threat to humans if they grow. A vital place of the human body and not removed, as it can develop because of a certain stimulus and become a malignant tumor. And from the above can be tumors malignant (malignant).
The main causes of brain tumors are not known at present, as are the rest of the tumors, but there are risk factors that can lead to tumors in the brain, including: a history in the family of brain tumors, smoking, exposure to radiation Especially in the head area, viral infections (eg a brain tumor can occur as a result of HIV infection), frequent exposure to toxic substances and others.
Symptoms of brain tumors: