What causes a brain tumor in adults

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A brain tumor can form in the brain cells as shown , or it can begin elsewhere and spread to the brain. 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. 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.
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Brain tumor - primary - adults

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Glioma - Symptoms and causes - Mayo Clinic

An acoustic neuroma vestibular schwannoma is a benign tumor that develops on the balance vestibular and hearing, or auditory cochlear nerves leading from your inner ear to the brain, as shown in the top image. The pressure on the nerve from the tumor may cause hearing loss and imbalance. In some cases, the tumor may grow and affect the cerebellum or other brain tissues, as shown in the computerized tomography CT scan and illustrations above. Acoustic neuroma, also known as vestibular schwannoma, is a noncancerous and usually slow-growing tumor that develops on the main vestibular nerve leading from your inner ear to your brain.
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What Causes Brain and Spinal Cord Tumors in Adults?

One type of brain cancer is glioblastoma multiforme, a grade IV astroyctoma. Glioblastoma multiforme accounts for 50 percent of gliomas, according to the University of Connecticut. As a grade IV brain tumor, glioblastoma multiforme are the most malignant type of astrocytoma. This type of brain tumor starts from astrocytes, a type of glial cell, which are supportive cells in the brain. While gliomas can occur without a known cause, certain conditions play a role in the onset of glioblastoma multiforme.
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In adults, metastatic tumors to the brain are actually more common than primary brain tumors, and they are treated differently. This information is about primary brain tumors. Unlike cancers that start in other parts of the body, tumors that start in the brain or spinal cord rarely spread to distant organs. Even so, brain or spinal cord tumors are rarely considered benign non-cancerous.
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