Adult brain tumors occur when the growth of cells in adults is massive. There are different kinds of brain tumors that the experts may detect—some may be cancerous, and some may be not. The tumor may start in some parts of the body and spread to other parts, including the brain.
Moreover, the growth of brain tumors may depend on and vary in every patient. Usually, brain tumors start when the cells undergo errors in their mutation— wherein the cell grows abnormally.
However, the brain tumors that occur in adults are considered less common than secondary brain tumors. Based on the size, type of tumor, and its location, the medication and treatment can vary.