Brain cancer can occur at any age, but it's most common in children under 15 and adults over 65. Nowadays it is striking people under the age of 40. A brain tumor is an abnormal, uncontrolled growth of cells within the brain tissue. They are usually classified into either primary or secondary. The primary brain tumors are tumors that arise directly from cells within the brain. Secondary types are the ones that spread from elsewhere in the body. The primary ones can either be benign type (Grade I)/ intermediate grade tumor (Grade II/III) or high grade tumor (Grade IV), Grade IV tumor is the dreadful cancerous type of brain tumor.
Studies are ongoing to establish the causes of brain tumor. Most of them arise by genetic mutations. Other known risk factors for brain tumors are usually exposure to ionizing radiations and exposure to allergens.
