A
brain tumor or
intracranial neoplasm occurs when abnormal cells form within the
brain. There are two main types of tumors: malignant or
cancerous tumors and
benign tumors. Cancerous tumors can be divided into
primary tumors that start within the brain, and
secondary tumors that have spread from somewhere else, known as
brain metastasis tumors. This article deals mainly with tumors that start within the brain. All types of brain tumors may produce symptoms that vary depending on the part of the brain involved. These may include
headaches,
seizures, problem with
vision,
vomiting, and
mental changes. The headache is classically worst in the morning and goes away with vomiting. More specific problems may include difficulty in walking, speaking and with sensation. As the disease progresses
unconsciousness may occur.